Add BDT tau algorithm flag in configuration

Following https://its.cern.ch/jira/browse/ATR-28687, this implements subtask 1 of the suggestion by @thompson .

This merge request affects 1 package:

• Trigger/TriggerCommon/TriggerJobOpts

This merge request affects 1 file:

• Trigger/TriggerCommon/TriggerJobOpts/python/TriggerConfigFlags.py

Adding @fwinkl ,@martindl ,@fpastore as watchers

added Trigger full-unit-tests main review-pending-level-1 labels

mentioned in merge request !68172 (merged)

CI Result SUCCESS (hash 785da1b8)

	Athena	AthAnalysis
externals
cmake
make
tests

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Athena: number of compilation errors 0, warnings 0
AthAnalysis: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-EL9 3753]

Looks good to me. Lucy (L1)

added review-approved label and removed review-pending-level-1 label

merged

mentioned in commit 76b282fa