Bring back `--repeat` CLI option

[sebastianbergmann]

IIRC, @epdenouden wants to look into this during next week's code sprint.

[curkan]

Yes please return

[epdenouden]

Returning does nobody any good when I'm still void

[Nutickets]

Hell to the yeah

[ERuban]

So then? 😀

[Bilge]

Want to see this backported for v10 also.

[PerryRylance]

We often use factories during testing, which in turn user faker and friends. I reached for this when running tests that deal with models that may or may not appear in a collection based on date, I understand we can restructure our tests (and this is what I was in the process of doing) - but it would be useful to have this back.