Add sub-repo permissions filtering to git.GetCommit, git.CommitExists, git.FirstEverCommit, git.Head (!29824) · Merge requests · Administrator / sourcegraph · GitLab

Administrator requested to merge mlw-filter-more-git-commit-functions-sub-repo into main Jan 17, 2022

Created by: mollylogue

Add sub-repo permissions filtering to git.GetCommit, git.CommitExists, git.FirstEverCommit, and git.Head
Add test coverage.
Add TODOs (will delete before merging this PR) to drive discussion on future work.