Add GitHub status-bubble support for PR against alternate remotes (e.g.: apple/WebKit instead of WebKit/WebKit).
<rdar://problem/99026301>
Pull request: https://github.com/WebKit/WebKit/pull/4704
Committed 254858@main (60afff0cd0b6): <https://commits.webkit.org/254858@main> Reviewed commits have been landed. Closing PR #4704 and removing active labels.