AFT-673: Remove BTagging from smart slimming lists; Refactoring FTag Slimming list

This follows up on !83860 (merged) which was pretty aggressive in removing the b-tagging object and thus broke a lot of derivations.

Note that I'm also removing the offline BTagging objects from the trigger derivations: the online versions should be recorded under another name, and we need to keep them, but the offline versions can no longer be produced.

Also this MR aims to to the following refactor:

• In the SlimmingHelper add BTaggingStandardContent to AntiKt4EMPFlow jets (and to any other small-R jets that currently have a BTagging_<jetCollection> "smart" list).
• In the ftag derivation code, replace the contents of BTaggingStandardContent with what we have in BTaggingless, and then remove Btaggingless.

Tagging @dguest @tstreble @dbaronmo @robouque @alfroch for FTag