fix: ensure contains is used as default filter in ComboBox

[alexdametto]

Closes #9233

✅ Pull Request Checklist:

• Included link to corresponding React Spectrum GitHub Issue. --> [RAC] ComboBox not using fallback contains function when explicitly passing defaultFilter: undefined property #9233
• Added/updated unit tests and storybook for this change (for new code or code which already has tests).
• Filled out test instructions.
• Updated documentation (if it already exists for this component).
• Looked at the Accessibility Practices for this feature - Aria Practices

📝 Test Instructions:

This PR fixes the bug in the github issue above. The best way to test this is to force passing defaultFilter: undefined and check that filtering still work as expected, falling back to contains function.

🧢 Your Project:

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