Resolve broken VP9 tests which were being run after VP9 was disabled during in tests
<rdar://problem/106328795>
Pull request: https://github.com/WebKit/WebKit/pull/11135
Pull request: https://github.com/WebKit/WebKit/pull/11173
Committed 261520@main (419ca9b09018): <https://commits.webkit.org/261520@main> Reviewed commits have been landed. Closing PR #11173 and removing active labels.