Added spellCheckConfiguration to the constructor of CupertinoTextFormFieldRow (#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 #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.

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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();