Do not use flags in PixelGeoDB

Tadej Novakrequested to merge
tadej/athena:pixel-geo-db into 23.0

Do not use flags in PixelGeoDB:

  • the IBL check seems redundant so just remove it
  • also remove the SLHC flag as it was included in this check
  • reorganise the code a bit to not do redundant DB queries

/cc @wlampl @tstreble @jmasik @dshope @sroe @tsulaia

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