Re-split hot reload error and hot restart tests (#170368)

After [combining](flutter/flutter#169860) these
2 tests, they became very flaky, especially on Mac and Windows, but also
on Linux.

Filed an issue: flutter/flutter#170062

Author: mdebbar

packages/flutter_tools/test/integration.shard/test_data/hot_reload_errors_common.dart

@@ -34,7 +34,7 @@ void testAll({
     });
 
     testWithoutContext(
-      'hot reload displays a formatted error message when removing a field from a const class, and hot restart succeeds',
+      'hot reload displays a formatted error message when removing a field from a const class',
       () async {
         await flutter.run(
           device:
@@ -53,9 +53,16 @@ void testAll({
             ),
           ),
         );
-
-        await expectLater(flutter.hotRestart(), completes);
       },
     );
+
+    testWithoutContext('hot restart succeeds when removing a field from a const class', () async {
+      await flutter.run(
+        device: chrome ? GoogleChromeDevice.kChromeDeviceId : FlutterTesterDevices.kTesterDeviceId,
+        additionalCommandArgs: additionalCommandArgs,
+      );
+      project.removeFieldFromConstClass();
+      await expectLater(flutter.hotRestart(), completes);
+    });
   });
 }

packages/flutter_tools/test/web.shard/hot_reload_web_errors_test.dart

@@ -2,7 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-@TestOn('linux') // https://github.com/flutter/flutter/issues/170062
 @Tags(<String>['flutter-test-driver'])
 library;