When running buildbot tests, it's possible for a single test to generate multiple failures. We should log each failure a test generates instead of only the first one.
<rdar://problem/111421739>
Pull request: https://github.com/WebKit/WebKit/pull/15351
Committed 266109@main (cbb27710e3ab): <https://commits.webkit.org/266109@main> Reviewed commits have been landed. Closing PR #15351 and removing active labels.