Provide View of a User's Branches

Release notes

Problem to solve

In a very active repository, it can be easy to forget about stale branches that you have created or contributed to and forget to delete them or continue the work on them.

Proposal

Add a tab "Yours" in the Repository > Branches view that allows a user to see the branches that they've pushed to in the last 12 months.

We will add a description to the page "Branches you pushed to over the last 12 months" to clarify that this only looks back 12 months as this is limitation of how we are able to determine what is yours

From gitlab-foss#43423 (comment 87689093)

We track pushes (who, what, when) in the events table which powers the activity feed, so we could use that. Note that it only holds 12 months of information, so we don't know who branches that were created more than 12 months ago belong to. If a branch received any new pushes in the last 12 months, we could pull the user information from the earliest or most recent event, but that would be confusing on a very active branch like master.

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