Add python option example of htl2 efficiency check with UT

There seems to be an example to check rates with python options with the UT:

https://gitlab.cern.ch/lhcb/DaVinci/-/blob/master/HltEfficiencyChecker/options/hlt2_rate_example_withUT.py

and an example to check the efficiency with the UT with the YAML option:

https://gitlab.cern.ch/lhcb/DaVinci/-/blob/master/HltEfficiencyChecker/options/hlt2_eff_example_withUT.yaml?ref_type=heads

but the corresponding python option is missing.