Don't create multiple model versions when running parallel steps

[schustmi]

Describe changes

The actual fix for this race condition would be to create the model versions server-side, however that is very complicated due to issues with different implementations of unique constraints for different MySQL flavors. This PR at least makes sure that only a single model version is created for a pipeline run.

Pre-requisites

Please ensure you have done the following:

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• I have added tests to cover my changes.
• I have based my new branch on develop and the open PR is targeting develop. If your branch wasn't based on develop read Contribution guide on rebasing branch to develop.
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  • Projects: Depending on the version dependencies, different projects might get affected.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Other (add details above)

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[schustmi]

Closed in favor of #3254