TrigOnlineMonitor: delete obsolete monitoring algorithms

Frank Winklmeierrequested to merge
fwinkl/athena:cleanup_onlmon into master

Delete the following obsolete monitoring algorithms that have not been used since a while and would first have to be migrated to athenaMT if really needed:

  • TrigL1TopoWriteValData
  • TrigMuCTPiROBMonitor
  • TrigROBMonitor

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