PyJobTransform: fix running asetup in sub-steps

Fix residual problems introduced by !71368 (merged). Always use setupATLAS to setup the asetup environment. Also fix and improve text on how to re-run container-based step locally.

Closes ATR-29401.

added full-unit-tests label

mentioned in merge request !71368 (merged)

This merge request affects 1 package:

• Tools/PyJobTransforms

This merge request affects 1 file:

• Tools/PyJobTransforms/python/trfExe.py

added Tools main review-pending-level-1 labels

WARNING: big files (>100K) are found in the changeset

112K in file Tools/PyJobTransforms/python/trfExe.py

CI Result SUCCESS (hash 64d6a5cb)

	Athena	AthSimulation	AthGeneration
externals
cmake
make
tests

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Athena: number of compilation errors 0, warnings 0
AthSimulation: number of compilation errors 0, warnings 0
AthGeneration: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-EL9 9643] (remote access info)

Looks good, approving --L1

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

merged

mentioned in commit ec3e74b4