[web] Re-enable test now that source of flakiness is fixed (#140462)

The test was flaky before due to overflowing GPU memory during the test.
The memory leak was fixed here
https://github.com/flutter/engine/pull/49214

Fixes https://github.com/flutter/flutter/issues/137669

As a side effect of the fix, this test also runs much faster, from about
3 minutes on my Macbook down to about 25 seconds.

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we expect every widget to implement].
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- [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] All existing and new tests are passing.

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packages/flutter/test/cupertino/text_field_test.dart

@@ -8390,13 +8390,10 @@ void main() {
     final EditableText editableText = tester.firstWidget(find.byType(EditableText));
     expect(editableText.clipBehavior, Clip.none);
 
-    // TODO(harryterkelsen): see https://github.com/flutter/flutter/issues/137669
-    if (!kIsWeb || !isCanvasKit) {
     await expectLater(
       find.byKey(const ValueKey<int>(1)),
       matchesGoldenFile('overflow_clipbehavior_none.cupertino.0.png'),
     );
-    }
   });
 
   testWidgets('can shift + tap to select with a keyboard (Apple platforms)', (WidgetTester tester) async {