Fix#28144
To make the resources will be cleanup once failed. All repository
operations now follow a consistent pattern:
- 1. Create a database record for the repository with the status
being_migrated.
- 2. Register a deferred cleanup function to delete the repository and
its related data if the operation fails.
- 3. Perform the actual Git and database operations step by step.
- 4. Upon successful completion, update the repository’s status to
ready.
The adopt operation is a special case — if it fails, the repository on
disk should not be deleted.
a100ac3306