MuonConfig: update RPC conditions override

Hello,

This MR is a follow-up of !69714, it updates the treatment of RPC conditions for "/RPC/TRIGGER/CM_THR_ETA" and "/RPC/TRIGGER/CM_THR_PHI" folders, to prepare for MC23e and the upcoming HLT global tag.
At the moment,
* there is an override for MC which seems no longer needed: more recent tags are available in the MC global tag, e.g. OFLCOND-MC23-SDR-RUN3-02 contains RPCTriggerCMThrEta_RUN12_MC23_01 which should probably be used instead of the hardcoded RPCTriggerCMThrEta_RUN12_MC16_04
* there is an override for data reprocessing using old offline tags, but there are more recent tags available for the HLT now, e.g. RPCTriggerCMThrEta_HLT-23-01. However this requires confirmation from experts (ATLGBLCONDTAGS-76). Once the new HLT global tag is available, it will contain the relevant tags, and the override won't be needed anymore.

Cheers,
Bertrand