[WebGPU] rg11b10ufloat should only report true for multisampling when WGPUFeatureName_RG11B10UfloatRenderable is enabled
<rdar://problem/119209975>
Pull request: https://github.com/WebKit/WebKit/pull/21351
Committed 271577@main (15c524be489d): <https://commits.webkit.org/271577@main> Reviewed commits have been landed. Closing PR #21351 and removing active labels.