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ByteStreamCnvSvc: Skip filling trigger bits in event header when creating transient ByteStream

Merged Rafal Bielski requested to merge rbielski/athena:bscnv-no-trigbits into 22.0

Transient ByteStream is used in RDOtoRDOTrigger to provide inputs for HLT Calo. Since this is input to HLT, it is created before any trigger decisions exist, and thus cannot contain trigger decision bits in the event header. Add an option in ByteStreamCnvSvc to skip reading in the trigger decision and filling the bits, and use this option in the transient bytestream configuration. For any other use case, replace the DEBUG message about missing trigger decision with a WARNING.

Fixes ATR-25971

Edited by Rafal Bielski