This sends `branch_list` in live `UpdateRepository` messages so
downstream repository snapshots stay in sync and the remote branch
picker can populate correctly. Collab DB replay for join/reconnect will
follow in a separate change.
This fixes a bug where the branch picker wouldn't show any branches in
remote environments
Self-Review Checklist:
- [x] I've reviewed my own diff for quality, security, and reliability
- [x] Unsafe blocks (if any) have justifying comments
- [x] The content is consistent with the [UI/UX
checklist](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist)
- [x] Tests cover the new/changed behavior
- [x] Performance impact has been considered and is acceptable
Closes#54530
Release Notes:
- git: Fix remote branch picker not showing any branches
Anthony Eid
08029066e6