AS requested by @jchapman in !36844 (merged) I have attempted to clean up the three MuonCalibConfig files in the repository, by moving the functionality of one from MuonRecExample to MuonCnvExample and renaming the MuonConfig one to MuonCalibrationConfig.
I'm pretty sure I got all clients, but let's do a full-unit-tests just in case.
Since I'm removing a file, there is a small chance that we pick up the removed file from a prior build, but I've been pretty careful with git grep and so I hope we can avoid a full rebuild.