feat: enhance backup process with lease management and attachment deletion

- Implemented a backup runner lease mechanism to prevent concurrent backup executions.
- Added `deleteAllAttachmentsForCiphers` function to delete attachments for multiple ciphers efficiently.
- Introduced `bulkDeleteAttachmentsByIds` method in storage to handle batch deletion of attachments.
- Updated backup execution logic to utilize the new lease management and ensure timely updates during the backup process.
- Refactored cipher deletion to handle attachments more effectively.
- Improved website icon loading with a dedicated caching mechanism for better performance.
- Added new index on `ciphers` table for `folder_id` to optimize queries related to folder management.
- Enhanced response handling for CORS policy to allow credentials for specific origins.

src/utils/response.ts

@@ -48,7 +48,7 @@ function getCorsPolicy(request: Request): { allowOrigin: string | null; allowCre
     return { allowOrigin: origin, allowCredentials: true };
   }
   if (isExtensionOrigin(origin)) {
-    return { allowOrigin: origin, allowCredentials: false };
+    return { allowOrigin: origin, allowCredentials: true };
   }
   return { allowOrigin: null, allowCredentials: false };
 }