Draft: Factor out unused btag configuration

Dan Guestrequested to merge
dguest/athena:cleanup-btag-run3-config into master

Quite a lot of the stuff in BTagRun2Config isn't used anywhere.

I'm moving whatever might be useful in the future into another file, so that I can be slightly less confused when I look at the code we actually use. I'm also removing some stuff that no one uses at all.

I hope this makes @duperrin less confused too.

Edited by Dan Guest

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