We need to run site-isolation tests singly so we can enable more and prevent test state leakage.
<rdar://problem/129069174>
Pull request: https://github.com/WebKit/WebKit/pull/29379
Committed 279592@main (b5bebf811063): <https://commits.webkit.org/279592@main> Reviewed commits have been landed. Closing PR #29379 and removing active labels.
Committed 279678@main (a5c9be9c588d): <https://commits.webkit.org/279678@main> Reviewed commits have been landed. Closing PR #29477 and removing active labels.