TrigHypothesis: Package cleanup (part 1)

Frank Winklmeierrequested to merge
fwinkl/athena:trighypo_cmake1 into master

Cleanup several packages under Trigger/TrigHypothesis:

  • cleanup cmake configuration and link dependencies
  • remove CLHEP dependency where relevant
  • enable flake8 where applicable
  • delete obsolete job options

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