refactor(web): use React Query for Google Drive folder operations

- Fix errors in connectors-api.service (use .issues instead of .errors)
- Create useGoogleDriveFolders hook with proper React Query integration
- Add Google Drive folders cache keys with proper query invalidation
- Refactor GoogleDriveFolderTree to use React Query hook for root data
- Remove manual state management (isInitialized, setRootItems, loadRootItems)
- Remove unused state (driveFolders, isLoadingFolders) from manage page
- Simplify handleOpenDriveFolderDialog function
- Automatic loading, caching, error handling, and refetching via React Query
- Better performance with proper caching and state management

surfsense_web/lib/query-client/cache-keys.ts

@@ -67,5 +67,9 @@ export const cacheKeys = {
 			["connectors", ...(queries ? Object.values(queries) : [])] as const,
 		byId: (connectorId: string) => ["connector", connectorId] as const,
 		index: () => ["connector", "index"] as const,
+		googleDrive: {
+			folders: (connectorId: number, parentId?: string) =>
+				["connectors", "google-drive", connectorId, "folders", parentId] as const,
+		},
 	},
 };