TrfTestsART: Disable several tests with legacy config and introduce serial merge CA tests

Johannes Elmsheuserrequested to merge
elmsheus/athena:trftestsart_20231005 into main

Updates to the TrfTestsART:

  • Disable the CA vs. legacy config tests
  • Disable the legacy config AOD/ESD merge tests
  • Add new AOD and ESD serial merge CA tests
  • Add new ESD MT merge CA test

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