Place a pytest mark on tests that use RMS API jobs

[mferrera]

These tests check-out an RMS license. We should enable ourselves to control when this happens with on-prem, in-RMS testing.

At least one function doing this exists:

xtgeo/tests/test_roxarapi/test_roxarapi_reek.py

Line 83 in 7173f59

def _run_blocked_wells_job(

It may be used in multiple tests (not sure).

[mferrera]

Every test with the requires_roxar mark is doing this already, although not with the intention of marking where an RMS Job API call is happening. A separate mark for it is probably redundant, at least for the moment.