[UI-side compositing] Have RemoteLayerTreeScrollingPerformanceData log data after each event
<rdar://problem/107424375>
Pull request: https://github.com/WebKit/WebKit/pull/12180
Committed 262378@main (715676da1913): <https://commits.webkit.org/262378@main> Reviewed commits have been landed. Closing PR #12180 and removing active labels.