gFEX monitoring for decoder errors

Sergi Rodriguez Bosca requested to merge serodrig/athena:GFexMonHLT into 23.0

This MR is meant to update the gFEX decoders to allow to store the gFEX error in one Global histogram. This will also allow to appear these histograms in the Online histogram at P1 (OHP). Discussed in ATR-27248

An example is:


Tagging @ctosciri @fizisist @landon and @rhowen for information

Edited by Sergi Rodriguez Bosca

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