TrigConfDBConnection: delete package

Merged Frank Winklmeier requested to merge fwinkl/athena:delete_TrigConfDBConnection into master

This alternative Python Frontier client was never finished/used and is obsolete.

Add the Frontier client dependency ( directly to the Athena project (this is already the case for AthGeneration).

Mentioning ATR-19150 to track package deletions.

Edited by Frank Winklmeier

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