collab: Add `head_commit_details` column to `project_repositories` (#29284)

This PR adds the `head_commit_details` column to the
`project_repositories` table, since it was missed in
https://github.com/zed-industries/zed/pull/29007.

Release Notes:

- N/A
f2cb6d69d5Marshall Bowers committed on 4/23/2025, 3:35:49 PM· committed by GitHubparent822b6f8
1 file changedLine totals unavailable