Setup and add EWS161, EWS162 to macOS-BigSur-Release-Build-EWS
<rdar://problem/100193809>
Pull request: https://github.com/WebKit/WebKit/pull/4952
Committed 255224@main (fe6a56d56be5): <https://commits.webkit.org/255224@main> Reviewed commits have been landed. Closing PR #4952 and removing active labels.