Added spellCheckConfiguration to the constructor of CupertinoTextFormFieldRow (flutter#159385)

Before: No way to set the _spellCheckConfiguration_ property of a
CupertinoTextFormFieldRow, meaning no spellcheck/highlighting of
incorrect words is present. This can be done on the standard
CupertinoTextField widget, but not the CupertinoTextFormFieldRow widget.

![image](https://github.com/user-attachments/assets/891721c4-020b-4a3f-9492-e2ba7a475bd5)

After: Adding this property allows the _spellCheckConfiguration_ to be
configured and spellcheck/highlighting of incorrect words working as
expected.

![image](https://github.com/user-attachments/assets/7b20692d-9444-4ce6-9b43-54bda7de2552)

![image](https://github.com/user-attachments/assets/3e86c901-4954-4ac2-9f63-bcdddfa3b43c)

Fixes flutter#159382 by adding the _ spellCheckConfiguration_ field to the
constructor of CupertinoTextFormFieldRow and passing the value through
to CupertinoTextField.borderless internally.

## Pre-launch Checklist

- [x] I read the [Contributor Guide] and followed the process outlined
there for submitting PRs.
- [x] I read the [Tree Hygiene] wiki page, which explains my
responsibilities.
- [x] I read and followed the [Flutter Style Guide], including [Features
we expect every widget to implement].
- [x] I signed the [CLA].
- [x] I listed at least one issue that this PR fixes in the description
above.
- [x] I updated/added relevant documentation (doc comments with `///`).
- [x] I added new tests to check the change I am making, or this PR is
[test-exempt].
- [x] I followed the [breaking change policy] and added [Data Driven
Fixes] where supported.
- [x] All existing and new tests are passing.

If you need help, consider asking for advice on the #hackers-new channel
on [Discord].

<!-- Links -->
[Contributor Guide]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#overview
[Tree Hygiene]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md
[test-exempt]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#tests
[Flutter Style Guide]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md
[Features we expect every widget to implement]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md#features-we-expect-every-widget-to-implement
[CLA]: https://cla.developers.google.com/
[flutter/tests]: https://github.com/flutter/tests
[breaking change policy]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#handling-breaking-changes
[Discord]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Chat.md
[Data Driven Fixes]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Data-driven-Fixes.md

Author: sargntpi

packages/flutter/lib/src/cupertino/text_form_field_row.dart

@@ -157,6 +157,7 @@ class CupertinoTextFormFieldRow extends FormField<String> {
       color: CupertinoColors.placeholderText,
     ),
     EditableTextContextMenuBuilder? contextMenuBuilder = _defaultContextMenuBuilder,
+    SpellCheckConfiguration? spellCheckConfiguration,
     super.restorationId,
   })  : assert(initialValue == null || controller == null),
         assert(obscuringCharacter.length == 1),
@@ -234,6 +235,7 @@ class CupertinoTextFormFieldRow extends FormField<String> {
                   placeholder: placeholder,
                   placeholderStyle: placeholderStyle,
                   contextMenuBuilder: contextMenuBuilder,
+                  spellCheckConfiguration: spellCheckConfiguration
                 ),
               ),
             );

packages/flutter/test/cupertino/text_form_field_row_test.dart

@@ -4,6 +4,7 @@
 
 import 'package:flutter/cupertino.dart';
 import 'package:flutter/rendering.dart';
+import 'package:flutter/src/services/spell_check.dart';
 import 'package:flutter_test/flutter_test.dart';
 
 void main() {
@@ -27,6 +28,29 @@ void main() {
     expect(textFieldWidget.textAlign, alignment);
   });
 
+  testWidgets('Passes spellCheckConfiguration to underlying CupertinoTextField', (WidgetTester tester) async {
+    final SpellCheckConfiguration spellCheckConfig = SpellCheckConfiguration(
+      spellCheckService: DefaultSpellCheckService(),
+      misspelledSelectionColor: const Color.fromARGB(255, 255, 255, 0)
+    );
+
+    await tester.pumpWidget(
+      CupertinoApp(
+        home: Center(
+          child: CupertinoTextFormFieldRow(
+            spellCheckConfiguration: spellCheckConfig,
+          ),
+        ),
+      ),
+    );
+
+    final Finder textFieldFinder = find.byType(CupertinoTextField);
+    expect(textFieldFinder, findsOneWidget);
+
+    final CupertinoTextField textFieldWidget = tester.widget(textFieldFinder);
+    expect(textFieldWidget.spellCheckConfiguration, spellCheckConfig);
+  });
+
   testWidgets('Passes scrollPhysics to underlying TextField', (WidgetTester tester) async {
     const ScrollPhysics scrollPhysics = ScrollPhysics();