Add initial implementation of evaluating changes generated by the assistant (#26799)

Release Notes:

- N/A

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Co-authored-by: Richard Feldman <oss@rtfeldman.com>
Co-authored-by: Thomas <thomas@zed.dev>
7a888de9f5Michael Sloan committed on 3/14/2025, 11:10:25 PM· committed by GitHubparente9b4fa1
14 files changedLine totals unavailable