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Avoid unnecessary access to DCM for online ROB retrieval (ATR-19179)

Werner Wiedenmann requested to merge wiedenat/athena:avoid_unnecessary_DCM_requests into master

When running with concurrent chains multiple requests for the same ROB id can be issued to the DCM for the same event slot. By locking the two ROB retrieval methods the coherency of the internal ROB cache can be achieved. More explanations on ATR-19179.

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