Remove "unnecessary" imports in foundation,gestures tests (#75007)

packages/flutter/test/foundation/diagnostics_json_test.dart

@@ -4,7 +4,6 @@
 
 import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
-import 'package:flutter/widgets.dart';
 import 'package:flutter_test/flutter_test.dart';
 
 void main() {

packages/flutter/test/foundation/service_extensions_test.dart

@@ -4,7 +4,6 @@
 
 import 'dart:async';
 import 'dart:convert';
-import 'dart:typed_data';
 import 'dart:ui' as ui;
 
 import 'package:flutter/foundation.dart';

packages/flutter/test/gestures/drag_test.dart

@@ -4,7 +4,6 @@
 
 import 'package:flutter_test/flutter_test.dart';
 import 'package:flutter/gestures.dart';
-import 'package:flutter/material.dart';
 
 import 'gesture_tester.dart';
 

packages/flutter/test/gestures/resampler_test.dart

@@ -2,8 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-import 'dart:ui';
-
 import 'package:flutter/gestures.dart';
 
 import '../flutter_test_alternative.dart';

packages/flutter/test/gestures/transformed_double_tap_test.dart

@@ -3,7 +3,6 @@
 // found in the LICENSE file.
 
 import 'package:flutter/material.dart';
-import 'package:flutter/widgets.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:flutter/gestures.dart';
 

packages/flutter/test/gestures/transformed_long_press_test.dart

@@ -3,7 +3,6 @@
 // found in the LICENSE file.
 
 import 'package:flutter/material.dart';
-import 'package:flutter/widgets.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:flutter/gestures.dart';
 

packages/flutter/test/gestures/transformed_monodrag_test.dart

@@ -5,7 +5,6 @@
 import 'dart:math' as math;
 
 import 'package:flutter/material.dart';
-import 'package:flutter/widgets.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:flutter/gestures.dart';
 

packages/flutter/test/gestures/transformed_scale_test.dart

@@ -3,9 +3,7 @@
 // found in the LICENSE file.
 
 import 'package:flutter/material.dart';
-import 'package:flutter/widgets.dart';
 import 'package:flutter_test/flutter_test.dart';
-import 'package:flutter/gestures.dart';
 
 void main() {
   testWidgets('gets local coordinates', (WidgetTester tester) async {

packages/flutter/test/gestures/transformed_tap_test.dart

@@ -3,7 +3,6 @@
 // found in the LICENSE file.
 
 import 'package:flutter/material.dart';
-import 'package:flutter/widgets.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:flutter/gestures.dart';