Cleanup and modernization of muon code

Include dropping of MuonFakeClustering and MuonCombRec, which were not used.

part of set of MR LHCb!3520 (merged) !2855 (merged) Alignment!260 (merged) Detector!177 (merged)

added cleanup new feature labels

added RTA label

mentioned in merge request LHCb!3520 (merged)

changed the description

mentioned in merge request Alignment!260 (merged)

• [2022-04-19 17:26] Validation started with lhcb-master-mr#4256
• [2022-04-19 21:52] Validation started with lhcb-master-mr#4257
• [2022-04-20 15:34] Validation started with lhcb-master-mr#4265
• [2022-04-21 18:24] Validation started with lhcb-master-mr#4273
• [2022-04-25 18:27] Validation started with lhcb-master-mr#4296
• [2022-04-26 11:30] Validation started with lhcb-master-mr#4301

mentioned in merge request Detector!177 (merged)

changed the description

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removed new feature label

added Muon label

FYI @rvazquez @desimone

merged

mentioned in commit 98e3a640

mentioned in issue Moore#426 (closed)