chore!: remove api.ts unnecessary calls (#22168)

> [!WARNING]  
> The change of the status code from `404` to `204` could break peoples
code downstream. Adding this as a breaking change incase.

Theres a whole ton of noise around failed requests, these are all
unrelated to the actual thing that is broken at hand (and are
confusing).

* Change `/api/v2/organizations/.../templates/.../versions/.../previous`
to return `204` instead of `404` (actually makes more sense because the
content doesn't exist, but the route is found.
* Remove unnecessary calls to `/api/v2/users/me/appearance` when the
user isn't logged in.
* Remove unnecessary calls to `/api/v2/deployment/stats` when the
deployment stats aren't allowed to be seen.
* Various changes to `workspace-sharing` so we don't make unnecessary
calls.

Whats left:

* `/api/v2/users/me` still `401`s on the login page. This persists as
when the user is logged in but tries to reach the sign-in page they
should be redirected to the app, not sign in again.
* `monaco-editor` is still upset... we theoretically could inject an
environment that can serve workers... but eh.

#### Old

```sh
% pnpm playwright:test -g "create workspace with default and required parameters"

> coder-v2@ playwright:test /home/coder/coder/site
> playwright test --config=e2e/playwright.config.ts -g 'create workspace with default and required parameters'

...

Running 2 tests using 1 worker

  ✓  1 …e/setup/addUsersAndLicense.spec.ts:7:5 › setup deployment (8.2s)
     2 ….ts:79:5 › create workspace with default and required parameters
[console][error] Failed to load resource: the server responded with a status of 401 (Unauthorized)
[console][error] Failed to load resource: the server responded with a status of 401 (Unauthorized)
[response] url=http://localhost:3111/api/v2/users/me/appearance status=401 body={"message":"You are signed out or your session has expired. Please sign in again to continue.","detail":"Cookie \"coder_session_token\" or query parameter must be provided."}
[response] url=http://localhost:3111/api/v2/users/me status=401 body={"message":"You are signed out or your session has expired. Please sign in again to continue.","detail":"Cookie \"coder_session_token\" or query parameter must be provided."}
[console][error] Failed to load resource: the server responded with a status of 403 (Forbidden)
[response] url=http://localhost:3111/api/v2/deployment/stats status=403 body={"message":"Forbidden.","detail":"You don't have permission to view this content. If you believe this is a mistake, please contact your administrator or try signing in with different credentials."}
[console][error] Failed to load resource: the server responded with a status of 403 (Forbidden)
[response] url=http://localhost:3111/api/v2/deployment/stats status=403 body={"message":"Forbidden.","detail":"You don't have permission to view this content. If you believe this is a mistake, please contact your administrator or try signing in with different credentials."}
[console][error] Failed to load resource: the server responded with a status of 404 (Not Found)
[response] url=http://localhost:3111/api/v2/organizations//provisionerdaemons status=404 body={"message":"Resource not found or you do not have access to this resource"}
[console][error] Failed to load resource: the server responded with a status of 404 (Not Found)
[response] url=http://localhost:3111/api/v2/organizations/default/templates/a4e8096d/versions/agreeable_glenn33/previous status=404 body={"message":"No previous template version found for \"agreeable_glenn33\"."}
[console][warning] Could not create web worker(s). Falling back to loading web worker code in main thread, which might cause UI freezes. Please see https://github.com/microsoft/monaco-editor#faq
[console][warning] You must define a function MonacoEnvironment.getWorkerUrl or MonacoEnvironment.getWorker
[console][error] Failed to load resource: the server responded with a status of 401 (Unauthorized)
[console][error] Failed to load resource: the server responded with a status of 401 (Unauthorized)
[response] url=http://localhost:3111/api/v2/users/me/appearance status=401 body={"message":"You are signed out or your session has expired. Please sign in again to continue.","detail":"Cookie \"coder_session_token\" or query parameter must be provided."}
[response] url=http://localhost:3111/api/v2/users/me status=401 body={"message":"You are signed out or your session has expired. Please sign in again to continue.","detail":"Cookie \"coder_session_token\" or query parameter must be provided."}
[console][error] Failed to load resource: the server responded with a status of 403 (Forbidden)
[response] url=http://localhost:3111/api/v2/deployment/stats status=403 body={"message":"Forbidden.","detail":"You don't have permission to view this content. If you believe this is a mistake, please contact your administrator or try signing in with different credentials."}
  ✓  2 …5 › create workspace with default and required parameters (7.0s)atus of 403 (Forbidden)
[response] url=http://localhost:3111/api/v2/deployment/stats status=403 body={"message":"Forbidden.","detail":"You don't have permission to view this content. If you believe this is a mistake, please contact your administrator or try signing in with different credentials."}
[console][error] Failed to load resource: the server responded with a status of 403 (Forbidden)
[response] url=http://localhost:3111/api/v2/deployment/stats status=403 body={"message":"Forbidden.","detail":"You don't have permission to view this content. If you believe this is a mistake, please contact your administrator or try signing in with different credentials."}

  2 passed (56.1s)
```

`23 LOL` (Lines of logs)

#### New

```sh
% pnpm playwright:test -g "create workspace with default and required parameters"

> coder-v2@ playwright:test /home/coder/coder/site
> playwright test --config=e2e/playwright.config.ts -g 'create workspace with default and required parameters'

...

Running 2 tests using 1 worker

  ✓  1 …e/setup/addUsersAndLicense.spec.ts:7:5 › setup deployment (8.7s)
     2 ….ts:79:5 › create workspace with default and required parameters
[console][error] Failed to load resource: the server responded with a status of 401 (Unauthorized)
[console][error] Failed to load resource: the server responded with a status of 401 (Unauthorized)
[response] url=http://localhost:3111/api/v2/users/me/appearance status=401 body={"message":"You are signed out or your session has expired. Please sign in again to continue.","detail":"Cookie \"coder_session_token\" or query parameter must be provided."}
[response] url=http://localhost:3111/api/v2/users/me status=401 body={"message":"You are signed out or your session has expired. Please sign in again to continue.","detail":"Cookie \"coder_session_token\" or query parameter must be provided."}
[console][warning] Could not create web worker(s). Falling back to loading web worker code in main thread, which might cause UI freezes. Please see https://github.com/microsoft/monaco-editor#faq
[console][warning] You must define a function MonacoEnvironment.getWorkerUrl or MonacoEnvironment.getWorker
  ✓  2 …5 › create workspace with default and required parameters (7.1s)atus of 401 (Unauthorized)
[console][error] Failed to load resource: the server responded with a status of 401 (Unauthorized)
[response] url=http://localhost:3111/api/v2/users/me/appearance status=401 body={"message":"You are signed out or your session has expired. Please sign in again to continue.","detail":"Cookie \"coder_session_token\" or query parameter must be provided."}
[response] url=http://localhost:3111/api/v2/users/me status=401 body={"message":"You are signed out or your session has expired. Please sign in again to continue.","detail":"Cookie \"coder_session_token\" or query parameter must be provided."}

  2 passed (32.0s)
```

`9 LOL` (Lines of logs)

site/src/api/api.ts

@@ -1097,25 +1097,17 @@ class ApiMethods {
 		templateName: string,
 		versionName: string,
 	) => {
-		try {
-			const response = await this.axios.get<TypesGen.TemplateVersion>(
-				`/api/v2/organizations/${organization}/templates/${templateName}/versions/${versionName}/previous`,
-			);
+		const response = await this.axios.get<TypesGen.TemplateVersion>(
+			`/api/v2/organizations/${organization}/templates/${templateName}/versions/${versionName}/previous`,
+		);
 
-			return response.data;
-		} catch (error) {
-			// When there is no previous version, like the first version of a
-			// template, the API returns 404 so in this case we can safely return
-			// undefined
-			const is404 =
-				isAxiosError(error) && error.response && error.response.status === 404;
-
-			if (is404) {
-				return undefined;
-			}
-
-			throw error;
+		// The API returns 204 No Content when there is no previous version
+		// (e.g. the first version of a template).
+		if (response.status === 204) {
+			return undefined;
 		}
+
+		return response.data;
 	};
 
 	/**