Remove RenderEditable dependency from TextSelectionHandleOverlay (#97967)

packages/flutter/test/material/text_field_test.dart

@@ -9138,7 +9138,7 @@ void main() {
     await tester.pumpAndSettle();
 
     final List<FadeTransition> transitions = find.descendant(
-      of: find.byWidgetPredicate((Widget w) => '${w.runtimeType}' == '_TextSelectionHandleOverlay'),
+      of: find.byWidgetPredicate((Widget w) => '${w.runtimeType}' == '_SelectionHandleOverlay'),
       matching: find.byType(FadeTransition),
     ).evaluate().map((Element e) => e.widget).cast<FadeTransition>().toList();
     expect(transitions.length, 2);

packages/flutter/test/widgets/editable_text_test.dart

@@ -4697,7 +4697,7 @@ void main() {
       // direction.
 
       final List<FadeTransition> transitions = find.descendant(
-        of: find.byWidgetPredicate((Widget w) => '${w.runtimeType}' == '_TextSelectionHandleOverlay'),
+        of: find.byWidgetPredicate((Widget w) => '${w.runtimeType}' == '_SelectionHandleOverlay'),
         matching: find.byType(FadeTransition),
       ).evaluate().map((Element e) => e.widget).cast<FadeTransition>().toList();
       expect(transitions.length, 2);

packages/flutter/test/widgets/selectable_text_test.dart

@@ -4128,7 +4128,7 @@ void main() {
     await tester.pumpAndSettle();
 
     final List<FadeTransition> transitions = find.descendant(
-      of: find.byWidgetPredicate((Widget w) => '${w.runtimeType}' == '_TextSelectionHandleOverlay'),
+      of: find.byWidgetPredicate((Widget w) => '${w.runtimeType}' == '_SelectionHandleOverlay'),
       matching: find.byType(FadeTransition),
     ).evaluate().map((Element e) => e.widget).cast<FadeTransition>().toList();
     expect(transitions.length, 2);