MuonByteStreamCnvTest: remove naughtyRetrieve

Frank Winklmeierrequested to merge
fwinkl/athena:MM_naughtyRetrieve into main

Remove use of naughtyRetrieve in MM and MDT RDOtoDigit testing code following the code pattern used for the actual digitization tools (see MRs linked in ATLASSIM-6004).

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