Extend `new-repo-disable-projects-and-wikis` feature to "forked" new repos.

[PeterDaveHello]

Description

It seems to be a handy feature, and I wonder maybe it can also work with those forked repos, not just whole new repos, thanks ;)

cc #3533 #3539

Example URLs

unspecified

[fregante]

Shouldn't be too difficult, however the feature is currently broken, so that would have to be fixed first. Would you be able to send a PR?

• new-repo-disable-projects-and-wikis: broken #7851