TrigValSteering: fix adding flags to transform preExec

As we no longer need to support "Modifiers" we can greatly simplify the code to add the flags to the transform preExec.

As this has the potential to break many trigger ART tests, testing this first in main before moving to 24.0.

Properly fixes problem observed in ATR-28872.

cc @sutt

This merge request affects 1 package:

• Trigger/TrigValidation/TrigValTools

This merge request affects 1 file:

• Trigger/TrigValidation/TrigValTools/python/TrigValSteering/ExecStep.py

Adding @fpastore ,@martindl ,@okumura ,@vmartin as watchers

added Trigger main review-pending-level-1 labels

changed the description

CI Result SUCCESS (hash 0845ae9a)

	Athena
externals
cmake
make
tests

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Athena: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-EL9 5562] (remote access info)

MR looks good to me, approving.

Cheers, Yuriy (L1)

removed review-pending-level-1 label

added review-approved label

mentioned in commit dcb7d660

merged

picked the changes into the branch cherry-pick-dcb7d660 with commit 575de25d

mentioned in commit 575de25d

mentioned in merge request !69451 (merged)