Remove DoNSW property from MuonSegmentRegionRecoveryTool and let MuonIdHelper tell which detectors are present

Hi,

this MR removes the DoNSW property from the MuonSegmentRegionRecoveryTool since it was assuming a symmetric NSW and this is not guaranteed to be realised for Run3. Furthermore, the MR adds an isInitialized method to the MuonIdHelper which allows to determine during runtime whether muon detector identifiers are part of the layout or not (since in case no identifier of a specific detector part is around, also the corresponding helper is not fully initialized).

Adding @rosati, @wleight and @cchau for muon software