Move the `WeightHelpers` to its only client

Merged Andrii Verbytskyi requested to merge averbyts/athena:move_weights into 23.0

Move the WeightHelpers to its only client. This MR:

  • just moves the code, but does not delete anything
  • will result in TruthUtils being a header-only library
  • prevent the overlinkage of the WeightHelpers code into hundreds of packages where it is not used.
  • commented out the WeightHelpers test

@jchapman @tadej

Edited by Andrii Verbytskyi

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