FastCaloSim: Switched to the retrieval of the Calo DD manager from Cond Store in unit tests

Vakhtang Tsulaiarequested to merge
tsulaia/athena:master-caloddmgr-fixes into master

Part of the ongoing migration of all clients of the Calo DD manager. Used here the same technique as the one used in !59422 (merged) (thanks @christos)

Closes ATLASRECTS-7438

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