Remove MuonDetectorManager calls from MuonAlignmentCondAlg (ATLASRECTS-5533)

Nicolas Koehlerrequested to merge
nkoehler/athena:rec5533 into master

Hi,

this MR removes the non-thread-safe MuonDetectorManager calls from MuonAlignmentCondAlg as described in ATLASRECTS-5533.

Best, Nico

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