Implement ServiceWorkerRegistration.getNotifications() Obvious and required followup to https://bugs.webkit.org/show_bug.cgi?id=22722
<rdar://problem/89194001>
Now rdar://105689245
Pull request: https://github.com/WebKit/WebKit/pull/13973
Committed 264169@main (bd5ff3526d34): <https://commits.webkit.org/264169@main> Reviewed commits have been landed. Closing PR #13973 and removing active labels.