Add LRT muon idperf chain

Julie Hart Kirkrequested to merge
hartj/athena:master-LRT-muon into master

Add a LRT muon idperf chain:

Add configuration needed in Muon files

Add chain HLT_mu6_idperfLRT_l2lrt_L1MU6 to the LS2_v1 menu

Update trigger count references for CI tests

Edited by Julie Hart Kirk

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