athenaHLT: remove usage of python include when running from DB/JSON

When running in athenaHLT from the DB or JSON files, we use TrigPSCPythonDbSetup.py to setup a minimal Python environment. Change this file from being an "include file" to a Python module.

Introduce helpers functions to alternatively include or import the file based on its file name extension. This will be important to support CA-based configurations.

Relates to ATR-26800.

This merge request affects 2 packages:

• HLT/Trigger/TrigControl/TrigCommon
• HLT/Trigger/TrigControl/TrigPSC

Affected files list will not be printed in this case

Adding @wiedenma ,@bernius ,@fwinkl ,@rbielski as watchers

added Trigger master review-pending-level-1 labels

The system determined that CI tests (with names matching "^CITest_SimulationRun(2|3)FullSim.*$") are not needed for this code change. They are not run. This is not an indicator to restart the job.

CI Result SUCCESS (hash 38268528)

	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-CC7 66260]

Approving. L1

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

added review-approved-tier0 label

added review-approved-point1 label

merged

mentioned in commit babd2cb7

added sweep:ignore label