Update DFSUSY

This MR contains some small fixes for the DerivationFramework, mainly to fix DAOD_PHYS for SUSY samples

• adding some missing files in DerivationFrameworkSUSY
• adding some if the changes recently pushed to 21.2 (stopping action-on-import in SUSYWeightMetadata.py), see MR
• removed TRUTH3.py from DFSUSY

Tagging also @crizzi, @zmarshal and @egramsta.