Enable new WebGL conformance tests, conformance/{attribs,buffers}
<rdar://problem/106754557>
Pull request: https://github.com/WebKit/WebKit/pull/11551
Committed 261765@main (e440bc97f4f0): <https://commits.webkit.org/261765@main> Reviewed commits have been landed. Closing PR #11551 and removing active labels.