fix(numberfield): preserve validation errors on blur when value unchanged

[snowystinger]

Closes #9444

Replaces #9629 because it didn't have a signed CLA

✅ Pull Request Checklist:

• Included link to corresponding React Spectrum GitHub Issue.
• 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:

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