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[ATR-28049] Support T0-style trigger reconstruction for Run 2 MC

Tim Martin requested to merge tamartin/athena:resolveTrigR2CAReco into main

Very minimal changes actually needed, as the majority of "offline" trigger reconstruction for MC happens during the RDO to RDO_TRIG substep.

  • Continue to veto Run 1 MC (currently unsupported workflow)
  • Support R2 navigation thinning (similar to R3 MC)
  • Support R2->R3 navigation conversion. NOTE: We intent to initially do this via AOD->DAOD, but nice to be able to support it during AOD production too in the future for the next R2 reprocessing to AOD in 2025 (cc @wprzygod)
  • Support R3 AOD/ESD level navigation thinning on any R2->R3 conversion output.

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