Improve error message when webkitbot fails to find identifier. Current error message might be confusing. As noted in: https://webkit.slack.com/archives/CU64U6FDW/p1690283091529659?thread_ts=1690272801.719669&cid=CU64U6FDW and https://webkit.slack.com/archives/C011ZPBCMGQ/p1690288769919449?thread_ts=1690288757.447369&cid=C011ZPBCMGQ
Pull request: https://github.com/WebKit/WebKit/pull/16065
Committed 266291@main (9ed56214691e): <https://commits.webkit.org/266291@main> Reviewed commits have been landed. Closing PR #16065 and removing active labels.
<rdar://problem/112836024>
Seems to be working fine, tested in https://webkit.slack.com/archives/C011ZPBCMGQ/p1690299827788729