Prevent accepting too many registrations at once (FE)

[kr-matthews]

The backend seems to allow this?

Edit: It would probably be good to have a test for this?

[FinnIckler]

interesting, I know we have a test for this on the backend. I will try it out and see what's going on

[kr-matthews]

I still think a frontend test would be good because without my changes if you select more rows than spots are available, the first few will be accepted before the rest are rejected and if the organizer didn't select the rows in the correct order (thinking it didn't matter) then the wrong competitors would get accepted.
ie even if the backend works perfectly, the frontend is still picking a (potentially unintuitive) order to accept the selected registrations in, so preventing accepting too many at once (as opposed to accepting the first few then stopping at the limit) seems pretty important and should have a test.

[FinnIckler]

I added a Test Competition with Low Limit