[py] Better runtime venv detection and python version check.

Lars Bilkerequested to merge
bilke/ogs:py-venv-fix into master

Existing venv detection was executed after the python script is evaluated. Now it executes before and also does a version check between venv and the embedded interpreter.

  1. Feature description was added to the changelog
  2. Tests covering your feature were added?
  3. Any new feature or behaviour change was documented?
Edited by Lars Bilke

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