[WebGPU] PipelineLayout::errorValidatingBindGroupCompatibility erroneously looks at stage_in vertex buffers counts
rdar://128596599
Pull request: https://github.com/WebKit/WebKit/pull/29009
Committed 279308@main (fdbf2f66e266): <https://commits.webkit.org/279308@main> Reviewed commits have been landed. Closing PR #29009 and removing active labels.