Add retry mechanism to after import

What does this MR do?

This MR implement the issue #198503 (closed)

MR !23306 (merged) add retry action for set_latest_merge_request_diff_ids.

There is another database save could have similar retriable failure, and this MR is to add retry action for it:

# /app/services/projects/after_import_service.rb:15
          repository.delete_all_refs_except(RESERVED_REF_PREFIXES)

Conformity

• [-] Changelog entry
• [-] Documentation (if required)
• Code review guidelines
• [-] Merge request performance guidelines
• Style guides
• [-] Database guides
• [-] Separation of EE specific content

Closes #198503 (closed)