Reverts "[web] Re-enable test now that source of flakiness is fixed" (#140515)

Reverts flutter/flutter#140462
Initiated by: cbracken
This change reverts the following previous change:
Original Description:
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.

packages/flutter/test/cupertino/text_field_test.dart

@@ -8390,10 +8390,13 @@ 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 {