When opportunistic sweeping is keeping up with the workload, don't sweep in a timer to avoid doing work in the measured time.
Pull request: https://github.com/WebKit/WebKit/pull/20114
Committed 270372@main (c84d7c42e219): <https://commits.webkit.org/270372@main> Reviewed commits have been landed. Closing PR #20114 and removing active labels.
<rdar://problem/118098021>