Enable new WebGL conformance tests, conformance/{programs,reading,renderbuffers,rendering}
<rdar://problem/107462499>
Pull request: https://github.com/WebKit/WebKit/pull/12310
Committed 262615@main (688752e2f646): <https://commits.webkit.org/262615@main> Reviewed commits have been landed. Closing PR #12310 and removing active labels.