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)

codersdk/templateversions.go

@@ -9,6 +9,7 @@ import (
 	"time"
 
 	"github.com/google/uuid"
+	"golang.org/x/xerrors"
 )
 
 type TemplateVersionWarning string
@@ -280,12 +281,19 @@ func (c *Client) CancelTemplateVersionDryRun(ctx context.Context, version, job u
 	return nil
 }
 
+// ErrNoPreviousVersion is returned when no previous template version
+// exists (the server responds with 204 No Content).
+var ErrNoPreviousVersion = xerrors.New("no previous template version")
+
 func (c *Client) PreviousTemplateVersion(ctx context.Context, organization uuid.UUID, templateName, versionName string) (TemplateVersion, error) {
 	res, err := c.Request(ctx, http.MethodGet, fmt.Sprintf("/api/v2/organizations/%s/templates/%s/versions/%s/previous", organization, templateName, versionName), nil)
 	if err != nil {
 		return TemplateVersion{}, err
 	}
 	defer res.Body.Close()
+	if res.StatusCode == http.StatusNoContent {
+		return TemplateVersion{}, ErrNoPreviousVersion
+	}
 	if res.StatusCode != http.StatusOK {
 		return TemplateVersion{}, ReadBodyAsError(res)
 	}