Set isolated tree mode to secondary AX thread in LayoutTests.
<rdar://problem/84269491>
Created attachment 441260 [details] Patch
/Volumes/Data/worker/Commit-Queue/build/Tools/ChangeLog neither lists a valid reviewer nor contains the string "Unreviewed" or "Rubber stamp" (case insensitive).
Created attachment 441630 [details] Patch
Committed r284395 (243171@main): <https://commits.webkit.org/243171@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 441630 [details].