Don't allow open excerpts in commit view for now (#27862)

Follow-up to https://github.com/zed-industries/zed/pull/27636

Release Notes:

- N/A
b59967bbdfMax Brunsfeld committed on 4/1/2025, 6:40:45 PM· committed by GitHubparent133d3f0
2 files changedLine totals unavailable