Use Python 3 for running various scripts in buildbot on EWS. Similar to https://commits.webkit.org/237914@main for build.webkit.org
Created attachment 429220 [details] [fast-cq] Patch
Committed r277825 (237971@main): <https://commits.webkit.org/237971@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 429220 [details].
<rdar://problem/78277553>