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Fix duplicate variation of BoostedJetTagger SF uncertainties

Oliver Majersky requested to merge omajersk/athena:AT-fix-boostedTagger-SFuncert into 21.2

This fixes twice-applied uncertainty on calibration scale factors for large-R jet taggers (BoostedJetTaggers package). The order of applying the uncertainties has changed from:

  1. Varying JES
  2. Tagging jet
  3. Varying tag SF

to:

  1. Tagging jet
  2. Varying JES
  3. Varying tag SF

since the tag scale factor already includes propagation of JES (and related) uncertainties. For reference, the relevant twiki describing the uncertainties usage: https://twiki.cern.ch/twiki/bin/viewauth/AtlasProtected/BoostedJetTaggingRecommendationFullRun2

Related to ANALYSISTO-859

Edited by Oliver Majersky

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