Remove some unused (and confusingly named) configuration files for btagging
We have a few duplicated chains of configuration files in b-tagging, often only differentiated by small differences in the name and the fact that one of them works and the other one doesn't. Of course this is a hazard to anyone who is trying to understand our code.
Luckily with some investigation it's possible to spot a few obvious unused files: at least of these imports things that don't exist, the so-called "split" configuration is now the standard, and we don't use release 21.2 in release 22 any more. I'm removing a few things that are clearly unused.