fix: ensure NumberField validation displays correct errors in React 19

[chirokas]

Closes #6684

Since the change event (which triggers commitValidation) occurs before the blur event (which triggers commit), numberValue remains in its previous state in the update scheduled by commitValidation.

As for why this works as expected in React 18 but not in React 19, I suspect it's related to the refactoring of the React Reconciler.
https://stackblitz.com/edit/vitejs-vite-qsexo8nh?file=README.md

✅ 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:

react-spectrum/packages/@react-spectrum/numberfield/test/NumberField.test.js

Line 2399 in a7b1a28

expect(input).not.toHaveAttribute('aria-describedby');

Doesn't look like we can test in React Testing Library.

🧢 Your Project: