Add the bot account "webkit-bug-bridge" to our list of validators. Also add this account to contributors.json.
<rdar://problem/104202490>
Pull request: https://github.com/WebKit/WebKit/pull/8623
Committed 258895@main (0455c38954f8): <https://commits.webkit.org/258895@main> Reviewed commits have been landed. Closing PR #8623 and removing active labels.