TrigConf2COOLOnline: Delete obsolete package

Frank Winklmeierrequested to merge
fwinkl/athena:delete_conf2cool into master

Standalone application to write trigger configuration to COOL/IS is no longer needed (see ATR-19823, ATR-20641).

cc @stelzer

List of all trigger package deletions: ATR-19150

Edited by Frank Winklmeier

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