chore(db): remove 23 unused database methods (#22999)

Removes 22 database query methods with no callers outside generated code
and the dbauthz wrapper layer (~1,600 lines).

**Security keys (6)** — superseded by `cryptokeys` package:
`GetAppSecurityKey`, `UpsertAppSecurityKey`, `GetOAuthSigningKey`,
`UpsertOAuthSigningKey`, `GetCoordinatorResumeTokenSigningKey`,
`UpsertCoordinatorResumeTokenSigningKey`

**Superseded queries (4):**
- `GetProvisionerJobsByIDs` → `GetProvisionerJobsByIDsWithQueuePosition`
- `GetDeploymentDAUs` / `GetTemplateDAUs` →
`GetTemplateInsightsByInterval`
- `GetWorkspaceBuildParametersByBuildIDs` + its `GetAuthorized...`
variant → unused

**OAuth2 (2):**
`GetOAuth2ProviderAppByRegistrationToken`,
`UpdateOAuth2ProviderAppSecretByID`

**Chat (4)** — pre-wired with no callers:
`GetChatModelConfigByProviderAndModel`, `DeleteChatMessagesByChatID`,
`ListChatsByRootID`, `ListChildChatsByParentID`

**Other (6):**
`DeleteGitSSHKey`, `UpdateUserLinkedID`, `GetFileIDByTemplateVersionID`,
`GetTemplateVersionHasAITask`, `InsertUserGroupsByName`,
`RemoveUserFromAllGroups`

coderd/database/queries/groupmembers.sql

@@ -31,25 +31,6 @@ WHERE group_id = @group_id
         user_is_system = false
         END;
 
--- InsertUserGroupsByName adds a user to all provided groups, if they exist.
--- name: InsertUserGroupsByName :exec
-WITH groups AS (
-    SELECT
-        id
-    FROM
-        groups
-    WHERE
-        groups.organization_id = @organization_id AND
-        groups.name = ANY(@group_names :: text [])
-)
-INSERT INTO
-    group_members (user_id, group_id)
-SELECT
-    @user_id,
-    groups.id
-FROM
-    groups;
-
 -- InsertUserGroupsByID adds a user to all provided groups, if they exist.
 -- name: InsertUserGroupsByID :many
 WITH groups AS (
@@ -71,12 +52,6 @@ FROM
 ON CONFLICT DO NOTHING
 RETURNING group_id;
 
--- name: RemoveUserFromAllGroups :exec
-DELETE FROM
-	group_members
-WHERE
-	user_id = @user_id;
-
 -- name: RemoveUserFromGroups :many
 DELETE FROM
 	group_members