Remove deprecated OverscrollIndicatorNotification.disallowGlow (#127050)

The deprecated OverscrollIndicatorNotification.disallowGlow has expired and is removed in the PR. The replacement is OverscrollIndicatorNotification.disallowIndicator. This deprecation was introduced in https://github.com/flutter/flutter/pull/87839 when the StretchingOverscrollIndicator was added. The name change made it clearer since there is now more than one overscroll indicator.

This change is supported by dart fix. ✅ 

Part of https://github.com/flutter/flutter/issues/127042

packages/flutter/lib/src/widgets/overscroll_indicator.dart

@@ -26,8 +26,8 @@ import 'transitions.dart';
 ///
 /// [GlowingOverscrollIndicator] generates [OverscrollIndicatorNotification]
 /// before showing an overscroll indication. To prevent the indicator from
-/// showing the indication, call [OverscrollIndicatorNotification.disallowGlow]
-/// on the notification.
+/// showing the indication, call
+/// [OverscrollIndicatorNotification.disallowIndicator] on the notification.
 ///
 /// Created automatically by [ScrollBehavior.buildOverscrollIndicator] on platforms
 /// (e.g., Android) that commonly use this type of overscroll indication.
@@ -999,16 +999,6 @@ class OverscrollIndicatorNotification extends Notification with ViewportNotifica
   /// Defaults to true, cannot be null.
   bool accepted = true;
 
-  /// Call this method if the glow should be prevented. This method is
-  /// deprecated in favor of [disallowIndicator].
-  @Deprecated(
-    'Use disallowIndicator instead. '
-    'This feature was deprecated after v2.5.0-6.0.pre.',
-  )
-  void disallowGlow() {
-    accepted = false;
-  }
-
   /// Call this method if the overscroll indicator should be prevented.
   void disallowIndicator() {
     accepted = false;