update-angle script complains and refuses to run if there are any files reported by `git status --porcelain`. This includes untracked files which should be ignored.
<rdar://problem/116381556>
Pull request: https://github.com/WebKit/WebKit/pull/18530
Committed 268837@main (ba90462eb61f): <https://commits.webkit.org/268837@main> Reviewed commits have been landed. Closing PR #18530 and removing active labels.