We need to forward `git-webkit`'s environment to `git commit` along with `COMMIT_MESSAGE_TITLE` and `COMMIT_MESSAGE_BUG`.
<rdar://problem/92885927>
Pull request: https://github.com/WebKit/WebKit/pull/552
Committed r293930 (250377@main): <https://commits.webkit.org/250377@main> Reviewed commits have been landed. Closing PR #552 and removing active labels.