Move buffer diff storage from `BufferStore` to `GitStore` (#26795)

Release Notes:

- N/A

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Co-authored-by: Max Brunsfeld <maxbrunsfeld@gmail.com>
Co-authored-by: max <max@zed.dev>
011f823f33João Marcos committed on 3/17/2025, 5:02:32 PM· committed by GitHubparent3d1ae68
13 files changedLine totals unavailable