Add service worker tests related to resultingClientId
<rdar://problem/107793594>
Submitted web-platform-tests pull request: https://github.com/web-platform-tests/wpt/pull/39439
Pull request: https://github.com/WebKit/WebKit/pull/12546
Committed 262757@main (4a28e3c7086d): <https://commits.webkit.org/262757@main> Reviewed commits have been landed. Closing PR #12546 and removing active labels.