Forking a repo in GitHub is not instant, and `git-webkit setup` may fail if creation of a private fork takes longer than we expect it to. First, we should have a better error message in this case. We should also be a bit more patient, GitHub advertises that forking may take a minute or two.
<rdar://problem/92978491>
Pull request: https://github.com/WebKit/WebKit/pull/568
Changing the title of this bug slightly because there is a very similar problem involving private forks coming from repos with the same name.
Landed https://commits.webkit.org/250423@main