We should replace shell.ShellCommand with shell.ShellCommandNewStyle everywhere in ews-buid.webkit.org. Old-style shell-commands are officially deprecated and will be removed in a future version of buildbot.
<rdar://problem/109463439>
Pull request: https://github.com/WebKit/WebKit/pull/13966
Committed 272863@main (1079c50e7aa9): <https://commits.webkit.org/272863@main> Reviewed commits have been landed. Closing PR #13966 and removing active labels.
Caused performance problems on ews-build.webkit.org, tracking revert in https://bugs.webkit.org/show_bug.cgi?id=268295