Throttle updates to Project#last_repository_updated_at.

What does this MR do?

This change throttles the update rate to project.last_repository_updated_at to once per 5 minutes interval.

A corresponding EE change is in https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/5875. This was only set up to check if any of the specs fail for EE because of this (there are no upstream merge conflicts).

Are there points in the code the reviewer needs to double check?

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Tests added for this feature/bug
• Conform by the code review guidelines
  • Has been reviewed by a Backend maintainer
  • Has been reviewed by a Database specialist
• Conform by the merge request performance guides
• Conform by the style guides
• If you have multiple commits, please combine them into a few logically organized commits by squashing them
• Internationalization required/considered
• End-to-end tests pass (package-and-qa manual pipeline job)

What are the relevant issue numbers?

https://gitlab.com/gitlab-org/gitlab-ce/issues/35364