Rename ConfiguredMCTruthAndBkgCatAlg to configured_MCTruthAndBkgCatAlg or similar

The helper function ConfiguredMCTruthAndBkgCatAlg in https://gitlab.cern.ch/lhcb/DaVinci/-/blob/master/Phys/DaVinci/python/DaVinci/truth_matching.py does not comply with our conventions for function names. It rather "looks" like a class name. I suggest we rename to configured_MCTruthAndBkgCatAlg or similar, to look more like the many make_... functions in the analysis stack. Now seems a good time to make the change since we anyway broke the FunTuple API with some MRs that will make it to the next DaVinci stack release.

On DPA task https://gitlab.cern.ch/lhcb-dpa/project/-/issues/121.