Fix memory leak in JetTagCalibCondAlg

Emmanuel Le Guirriecrequested to merge
guirriec/athena:FlavTag_Fix_ATLASRECTS-4868 into master
  • Use unique_ptr to read histograms in Root file (ATLASRECTS-4868)
  • Remove python WARNING for calibration conditions (ATLASRECTS-4876)
  • Turn WARNING to DEBUG for DL1 calibration

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