Update WebGL conformance test suite 2022-09-23
<rdar://problem/100319850>
Pull request: https://github.com/WebKit/WebKit/pull/4621
Pull request: https://github.com/WebKit/WebKit/pull/4627
Pull request: https://github.com/WebKit/WebKit/pull/4966
Committed 255159@main (d5ab79c0da46): <https://commits.webkit.org/255159@main> Reviewed commits have been landed. Closing PR #4966 and removing active labels.