Fix MaterialStateBorderSide lerp in the Checkbox and chips (#148124)
fixes [`Checkbox` and Chips side with `MaterialStateBorderSide` doesn't lerp in their theme](https://github.com/flutter/flutter/issues/135136)
### Code sample
<details>
<summary>expand to view the code sample</summary>
```dart
import 'package:flutter/material.dart';
import 'package:flutter_test/flutter_test.dart';
void main() {
testWidgets('test', (WidgetTester tester) async {
late ColorScheme colorScheme;
Widget buildCheckbox({required Color seedColor}) {
colorScheme = ColorScheme.fromSeed(seedColor: seedColor);
return MaterialApp(
theme: ThemeData(
colorScheme: colorScheme,
checkboxTheme: CheckboxThemeData(
side: MaterialStateBorderSide.resolveWith(
(Set<MaterialState> states) {
return BorderSide(
color: colorScheme.primary,
width: 4.0,
);
}),
),
),
home: Scaffold(
body: Center(
child: Checkbox(
value: false,
onChanged: (_) {},
),
),
),
);
}
await tester.pumpWidget(buildCheckbox(seedColor: Colors.red));
await tester.pumpAndSettle();
RenderBox getCheckboxRenderer() {
return tester.renderObject<RenderBox>(find.byType(Checkbox));
}
expect(getCheckboxRenderer(), paints..drrect(color: colorScheme.primary));
await Future<void>.delayed(const Duration(seconds: 3));
await tester.pumpWidget(buildCheckbox(seedColor: Colors.blue));
await tester.pump();
await Future<void>.delayed(const Duration(seconds: 3));
expect(getCheckboxRenderer(), paints..drrect(color: colorScheme.primary));
});
}
```
</details>
| Before | After |
| --------------- | --------------- |
| <img src="https://github.com/flutter/flutter/assets/48603081/6df34104-37ba-4a82-b5cb-7ed4f887992a" /> | <img src="https://github.com/flutter/flutter/assets/48603081/44359248-a101-46eb-a85a-77f976da5f0f" /> |
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