Move git status out of Entry

[mikayla-maki]

• Rewrite worktree git handling
• Fix tests
• Fix test_propagate_statuses_for_repos_under_project
• Replace WorkDirectoryEntry with WorkDirectory in RepositoryEntry
• Add a worktree event for capturing git status changes
• Confirm that the local repositories are correctly updating the new WorkDirectory field
• Implement the git statuses query as a join when pulling entries out of worktree
• Use this new join to implement the project panel and outline panel.
• Synchronize git statuses over the wire for collab and remote dev

Release Notes:

• N/A

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