Update digitization unit tests and art build tests after !62318 (ATLASSIM-6559)

Merged John Derek Chapman requested to merge jchapman/athena:UpdateDigiUnitTest_23.0 into 23.0
  • Digitization/test_Digitization.sh - update script to use an MC20a CA-based configuration
  • SimuJobTransforms/test_pileup.sh - update script to use script to use an MC20e-like CA-based configuration
  • SimuJobTransforms/test_diffmerged.sh - update script to MC23-style configuration

Should fix ATLASSIM-6559

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