Fix new config wrapping for InDet and Muon, remove wrapping anti-patterns

This fixes a bug with the InDet wrapping, and adds the ability to wrap Muon standalone.

Also, this replaces !47487 (closed), where @fwinkl spotted that retrieving Configurable classes at module level does not play nicely with CAtoGlobalWrapper, i.e. where we want to use CA config in old configuration fragments.

Tested locally with make test, and with flags on, but this is all off by default so it should be completely safe.