project: Change Git repo automatically with change in file buffer

[rufevean]

Summary

• Auto-activates the active repository when opening a buffer.
• Prepares branching for future support of a user choice (e.g., auto_activate_repo_on_open flag).

Release Notes

• Improved: Opening a buffer now automatically updates the active repository.

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[rufevean]

@cla-bot check

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[zed-industries-bot]

	Warnings
⚠️	This PR is missing release notes. Please add a "Release Notes" section that describes the change: Release Notes: - Added/Fixed/Improved ... If your change is not user-facing, you can use "N/A" for the entry: Release Notes: - N/A

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[cole-miller]

Thanks @rufevean, this seems like a good improvement! There are a couple of changes needed to get it ready to merge:

• I don't think BufferOpened is the right event to listen for; we should use WorkspaceEvent::ActiveItemChanged, which is emitted (for example) when you switch to a different tab, whereas BufferOpened is only opened when you open a new buffer for a file.
• When ActiveItemChanged happens, we should call Workspace::active_project_path to get a ProjectPath, and then GitStore::repository_and_path_for_project_path to resolve the new active repository.

[rufevean]

@cla-bot check

[cla-bot]

The cla-bot has been summoned, and re-checked this pull request!

[cole-miller]

Thanks!