[PWGGAJE] Param Model: better multiplicity model

[aimeric-landou]

No description provided.

[github-actions]

REQUEST FOR PRODUCTION RELEASES:
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The following labels are available
async-2023-pbpb-apass4
async-2023-pp-apass4
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async-2024-PbPb-apass1
async-2024-ppRef-apass1
async-2024-PbPb-apass2
async-2023-PbPb-apass5

[aimeric-landou]

The syntax issues are from files that I have not edited:

Error found in GRID/utils/getCCDBTimeMachineTimestamp.py line 92:
Error: Value 'result['as_of']' is unsubscriptable
Error found in MC/bin/tests/test_anchoring_rampup.py line 39:
Error: No value for argument 'ITS_rampup' in function call
Error found in MC/bin/tests/test_anchoring_rampup.py line 44:
Error: No value for argument 'ITS_rampup' in function call
Error found in MC/bin/tests/test_anchoring_rampup.py line 50:
Error: No value for argument 'ITS_rampup' in function call
Error found in MC/bin/tests/test_anchoring_rampup.py line 57:
Error: No value for argument 'ITS_rampup' in function call
Error found in MC/bin/tests/test_anchoring_rampup.py line 64:
Error: No value for argument 'ITS_rampup' in function call
Error: Process completed with exit code 123.