Prevent some race conditions

[schustmi]

Describe changes

This PR adds some unique constraint to avoid race conditions when creating entities, and also moves the retry logic for model version creation to the server.

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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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[avishniakov]

Only a minor comment, assuming tests will pass smoothly.

[github-actions]

Classification template updates in examples/mlops_starter have been pushed.

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[github-actions]

E2E template updates in examples/e2e have been pushed.

[github-actions]

NLP template updates in examples/e2e_nlp have been pushed.