[WebGPU] Overrides with duplicate @id(values) are not rejected
<rdar://problem/119520604>
Pull request: https://github.com/WebKit/WebKit/pull/21658
Committed 271956@main (8db4245f77a3): <https://commits.webkit.org/271956@main> Reviewed commits have been landed. Closing PR #21658 and removing active labels.