TriggerMenuMT: remove TriggerMenu dependency and cleanup

Frank Winklmeierrequested to merge
fwinkl/athena:tmmt_cleanup into master

Remove dependency on the old TriggerMenu package. Make a copy of TriggerTypeDefRun1.py. Delete unused ItemDefRun1.py.

Other cleanup:

  • Delete unused testMenuMT.sh, trigermenuMT_test.py, generateMenuMT.py.
  • Delete generateMT.py and instead inline the flags in test_HLTmenu.sh.
  • Move flake8 checking to build stage.

NB: The latter part was originally done in !33843 (merged) but had to be reverted again due to unrelated issues in that MR.

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