Fix <Form> ignores resetOptions when record changes

[Jszigeti]

Problem

When using <Form> or <SimpleForm> with resetOptions={{ keepDirtyValues: true }} (typically for AutoSave), dirty form values were lost when the record was refetched.

Scenario:

1. User opens a form and starts typing in a field (form becomes dirty)
2. An action triggers a record refetch (e.g., changing a related field, external update)
3. The user's unsaved input disappears — overwritten by server data

This is a follow-up fix to #8911. While that PR forwarded resetOptions to useForm, it didn't pass it to the manual reset() call in the useEffect, causing keepDirtyValues to be ignored when the record is refetched.

---

Solution

• Fixed useAugmentedForm.ts to pass resetOptions to reset() when the record changes
• Added logic to detect record ID changes vs refetches:
  • Same record ID (refetch): apply resetOptions (e.g., keepDirtyValues: true)
  • Different record ID (navigation): do a full reset to avoid carrying dirty values from the previous record
• Added resetOptions to the UseFormOwnProps interface

Added unit tests in Form.spec.tsx covering:

• keepDirtyValues: true preserves user input during refetch (same ID)
• Without keepDirtyValues, server values overwrite user input
• Switching to a different record (different ID) always does a full reset

---

How To Test

1. Create a form with resetOptions={{ keepDirtyValues: true }} and AutoSave enabled
2. Modify a field (make the form dirty)
3. Trigger a record refetch (e.g., by changing a related field that causes invalidation)
4. Expected result: The modified field value is preserved, not overwritten by server data
5. Run tests:
   • make test - Unit tests pass (2595 passed, 9 unrelated failures on master)
   • npx jest packages/ra-core/src/form/Form.spec.tsx - All 40 tests pass

---

Additional Checks

• The PR targets master for a bugfix
• The PR includes unit tests (Form.spec.tsx)
• No story update required (visual behavior unchanged)
• No documentation change required (fixes existing documented behavior that wasn't working)

---

Notes

• Root cause: Simplify form reset on record change, and forward supported props from useAugmentedForm to useForm #8911 forwarded resetOptions to useForm, but the useEffect that manually calls reset() when the record changes didn't pass resetOptions to the reset() call.
• The fix also ensures that when navigating to a different record (ID change), a full reset is performed regardless of resetOptions. This prevents dirty values from record A being incorrectly preserved when viewing record B.
• No breaking changes.
• Fixes data loss issue affecting forms with AutoSave + external record updates.

I'm happy to adjust anything if needed 👍