fix: DIA-1428: Increase test coverage for Prompts/Predictions deletion

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Hi @niklub!

This PR was automaticaly generated via Follow Merge. Please ensure that all linked upstream Pull Requests are merged before proceeding with this one.

• https://github.com/HumanSignal/label-studio-client-generator/pull/25 linked by Workflow Run

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:rocket:	This description was created by Ellipsis for commit 716e0e7c52cb7ff8e6c4f6532de47eb27632fb5c

fix: increase test coverage for prompt and prediction deletion

Summary:

Enhance test coverage and API functionality for prompt and prediction management, including CRUD operations for prompts and their versions.

Key points:

• API Enhancements:
  • Added get, delete, and update methods for PromptsClient in client.py.
  • Added list, get, delete, and update methods for VersionsClient in versions/client.py.
• Model Changes:
  • Updated PromptVersion in prompt_version.py to make fields optional.
• Test Coverage:
  • Added tests for list, get, delete, and update methods in test_versions.py.
  • Added tests for get, delete, and update methods in test_prompts.py.

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