Fix chips use square delete button InkWell shape instead of circular (#144319)

fixes [Chips delete button hover style is square, not circular](https://github.com/flutter/flutter/issues/141335)

### Code sample

<details>
<summary>expand to view the code sample</summary> 

```dart
import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        body: Center(
          child: RawChip(
            label: const Text('Test'),
            onPressed: null,
            deleteIcon: const Icon(Icons.clear, size: 18),
            onDeleted: () {},
          ),
        ),
      ),
    );
  }
}
```

</details>

### Preview

| Before | After |
| --------------- | --------------- |
| <img src="https://github.com/flutter/flutter/assets/48603081/c5d62c57-97b3-4f94-b83d-df13559ee3a8" /> | <img src="https://github.com/flutter/flutter/assets/48603081/b76edaab-73e0-4aa9-8ca2-127eedd77814"  /> |

packages/flutter/lib/src/material/chip.dart

@@ -1191,6 +1191,7 @@ class _RawChipState extends State<RawChip> with MaterialStateMixin, TickerProvid
           radius: (_kChipHeight + (widget.padding?.vertical ?? 0.0)) * .45,
           // Keeps the splash from being constrained to the icon alone.
           splashFactory: _UnconstrainedInkSplashFactory(Theme.of(context).splashFactory),
+          customBorder: const CircleBorder(),
           onTap: widget.isEnabled ? widget.onDeleted : null,
           child: IconTheme(
             data: theme.iconTheme.copyWith(

packages/flutter/test/material/chip_test.dart

@@ -144,6 +144,7 @@ Widget chipWithOptionalDeleteButton({
   TextDirection textDirection = TextDirection.ltr,
   String? chipTooltip,
   String? deleteButtonTooltipMessage,
+  double? size,
   VoidCallback? onPressed = doNothing,
   ThemeData? themeData,
 }) {
@@ -156,7 +157,11 @@ Widget chipWithOptionalDeleteButton({
           tooltip: chipTooltip,
           onPressed: onPressed,
           onDeleted: deletable ? doNothing : null,
-          deleteIcon: Icon(Icons.close, key: deleteButtonKey),
+          deleteIcon: Icon(
+            key: deleteButtonKey,
+            size: size,
+            Icons.close,
+          ),
           deleteButtonTooltipMessage: deleteButtonTooltipMessage,
           label: Text(
             deletable
@@ -1852,6 +1857,7 @@ void main() {
         labelKey: labelKey,
         deleteButtonKey: deleteButtonKey,
         deletable: true,
+        size: 18.0,
       ),
     );
 
@@ -1957,6 +1963,7 @@ void main() {
         onPressed: null,
         deleteButtonKey: deleteButtonKey,
         deletable: true,
+        size: 18.0,
       ),
     );
 
@@ -5385,6 +5392,62 @@ void main() {
     expect(labelTopRight.dx, deleteIconCenter.dx - (iconSize / 2) - labelPadding);
   });
 
+  testWidgets('Default delete button InkWell shape', (WidgetTester tester) async {
+    await tester.pumpWidget(wrapForChip(
+      child: Center(
+        child: RawChip(
+          onDeleted: () { },
+          label: const Text('RawChip'),
+        ),
+      ),
+    ));
+
+    final InkWell deleteButtonInkWell = tester.widget<InkWell>(find.ancestor(
+      of: find.byIcon(Icons.cancel),
+      matching: find.byType(InkWell).last,
+    ));
+    expect(deleteButtonInkWell.customBorder, const CircleBorder());
+  });
+
+  testWidgets('Default delete button overlay', (WidgetTester tester) async {
+    final ThemeData theme = ThemeData();
+    await tester.pumpWidget(wrapForChip(
+      child: Center(
+        child: RawChip(
+          onDeleted: () { },
+          label: const Text('RawChip'),
+        ),
+      ),
+      theme: theme,
+    ));
+
+    RenderObject inkFeatures = tester.allRenderObjects.firstWhere((RenderObject object) => object.runtimeType.toString() == '_RenderInkFeatures');
+    expect(inkFeatures, isNot(paints..rect(color: theme.hoverColor)));
+    expect(inkFeatures, paintsExactlyCountTimes(#clipPath, 0));
+
+    // Hover over the delete icon.
+    final Offset centerOfDeleteButton = tester.getCenter(find.byType(Icon));
+    final TestGesture hoverGesture = await tester.createGesture(kind: PointerDeviceKind.mouse);
+    await hoverGesture.moveTo(centerOfDeleteButton);
+    addTearDown(hoverGesture.removePointer);
+    await tester.pumpAndSettle();
+
+    inkFeatures = tester.allRenderObjects.firstWhere((RenderObject object) => object.runtimeType.toString() == '_RenderInkFeatures');
+    expect(inkFeatures, paints..rect(color: theme.hoverColor));
+    expect(inkFeatures, paintsExactlyCountTimes(#clipPath, 1));
+
+    const Rect expectedClipRect = Rect.fromLTRB(124.7, 10.0, 142.7, 28.0);
+    final Path expectedClipPath = Path()..addRect(expectedClipRect);
+    expect(
+      inkFeatures,
+      paints..clipPath(pathMatcher: coversSameAreaAs(
+        expectedClipPath,
+        areaToCompare: expectedClipRect.inflate(48.0),
+        sampleSize: 100,
+      )),
+    );
+  });
+
   group('Material 2', () {
     // These tests are only relevant for Material 2. Once Material 2
     // support is deprecated and the APIs are removed, these tests