Remove unreachable/invalid commits related entries from activity feed

Everyone can contribute. Help move this issue forward while earning points, leveling up and collecting rewards.

• Close this issue

Proposal

Do not list in the profile activity feed (or delete the activity entries) for the following:

• commits that are unreachable or dangling
• commits that have invalid hashes (ie: the one where https://gitlab.com/\<username>/<project>/-/commit/<commit hash> displays a 404 Git Resource Not Found)

note : this proposal may be extended to any object (blob, tree, branch, etc) that is unreachable or with invalid hash.
note 2: in case dangling objects may have some uses, we can just consider the ones with invalid hashes.

Steps to reproduce

1. create repo
2. make some commits and push
3. introduce a dangling commit and force push
4. run housekeeping and Prune Unreachable Objects
5. make sure the commit hash return a 404 (using https://gitlab.com/\<username>/<project>/-/commit/<commit hash>)
6. go to the profile and still see the entry related to the commit with a now invalid hash

@gitlab-bot label user profile