FTAG: Adding GNNAuxTaskDecorator

Alexander Frochrequested to merge
alfroch/athena:add-GNNAuxTaskDecorator into 24.0

This MR adds the following:

  • Adding the GNNAuxTaskDecoratorAlg from main, including the changes in !78580 (merged)

Tagging @dguest @svanstro @hartman

Edited by Alexander Froch

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