TriggerJobOpts: cleanup slice flags
Cleanup the (old) SliceFlags:
- delete
Tier0TriggerFlags
,CommonSignatureFlags
- rename
SliceFlagsMT
->SliceFlags
- remove some unused slice flags and aliases across all files
Also delete unused Utils.py
and enable a few extra flake8 checks.
Waiting for !41479 (merged).
Edited by Frank Winklmeier