Some swipe tests leave UIScripts running (bug 236794) so rewrite them to use async/await.
Pull request: https://github.com/WebKit/WebKit/pull/2921
Committed 253171@main (2ba1d4125996): <https://commits.webkit.org/253171@main> Reviewed commits have been landed. Closing PR #2921 and removing active labels.
<rdar://problem/98224802>