MuonCondAlg: Fix memory leak in NswCalibDbAlg
This MR fixes the massive memory leak in NswCalibDbAlg
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Closes ATLASRECTS-7083 and relates to ATR-25529
Edit: Now the algorithm doesn't do anything if the write handles are still valid so that we don't end up executing unnecessary code in serial jobs.
Edited by Alaettin Serhan Mete