[WebGPU] Device::hasFeature() and Adapter::hasFeature() only check that list is not empty
radar://128671215
Pull request: https://github.com/WebKit/WebKit/pull/29065
Committed 279293@main (862497bc118b): <https://commits.webkit.org/279293@main> Reviewed commits have been landed. Closing PR #29065 and removing active labels.