[workspace] fix default data source not set when re-associating after deletion

[Qxisylolo]

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Description

This pr fixes default data source not set when re-associating after deletion In this implementation, if a default data source is not set, automatically set the first selected data source as default.

To reproduce

  1. deletes all existing data sources.
  2. Then, re-associates a data source.

Screenshot

before: https://github.com/user-attachments/assets/77ca648e-f2be-42d4-8683-337312cf6ddf

after: https://github.com/user-attachments/assets/560fd387-0f9c-4050-969a-14c81e987575

Testing the changes

Changelog

• fix: fix default data source not set when re-associating after deletion

Check List

• [ ] All tests pass
  • [ ] yarn test:jest
  • [ ] yarn test:jest_integration
• [ ] New functionality includes testing.
• [ ] New functionality has been documented.
• [ ] Update CHANGELOG.md
• [ ] Commits are signed per the DCO using --signoff