[WebGPU] Make RemoteGPU owned by RemoteRenderingBackend rather than GPUConnectionToWebProcess
Pull request: https://github.com/WebKit/WebKit/pull/12724
<rdar://problem/108171820>
Committed 263054@main (e6f858aaaea1): <https://commits.webkit.org/263054@main> Reviewed commits have been landed. Closing PR #12724 and removing active labels.