unit tests: test that each stage works with arbitary binning

[jllanfranchi]

Binning orders I can think of that the user might specify (some are ok if they don't work in certain stages, if there's a good reason why that binning choice should fail):

e
cz
az
e, cz
cz, e
e, cz, az
e, az, cz
cz, e, az
cz, az, e
az, e, cz
az, cz, e

and eventually we'll have a pid binning as well...

[LeanderFischer]

I think our setup doesn't really allow for arbitrary binnings anyway, so not sure checking that it works for every stage makes sense at all :see_no_evil: