Skip web hot reload tests that test execution for all platforms for now (#162682)

flutter/flutter#162567

There's a general timing error that may occur when loading scripts,
where main might be run before the scripts are done loading, leading to
a crash. These tests test that output is being printed to stdout, and
wait forever for that, leading to timeouts. This is flaky, so the race
condition may or may not occur.

## Pre-launch Checklist

- [X] I read the [Contributor Guide] and followed the process outlined
there for submitting PRs.
- [X] I read the [Tree Hygiene] wiki page, which explains my
responsibilities.
- [X] I read and followed the [Flutter Style Guide], including [Features
we expect every widget to implement].
- [X] I signed the [CLA].
- [X] I listed at least one issue that this PR fixes in the description
above.
- [X] I updated/added relevant documentation (doc comments with `///`).
- [X] I added new tests to check the change I am making, or this PR is
[test-exempt].
- [X] I followed the [breaking change policy] and added [Data Driven
Fixes] where supported.
- [X] All existing and new tests are passing.

Example of a timeout:
https://ci.chromium.org/ui/p/flutter/builders/try/Linux%20web_tool_tests/50762/overview

Author: srujzs

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

@@ -5,8 +5,6 @@
 @Tags(<String>['flutter-test-driver'])
 library;
 
-import 'dart:io';
-
 import '../integration.shard/test_data/hot_reload_test_common.dart';
 import '../src/common.dart';
 
@@ -17,6 +15,6 @@ void main() {
       '--extra-front-end-options=--dartdevc-canary,--dartdevc-module-format=ddc',
     ],
     // https://github.com/flutter/flutter/issues/162567
-    skip: Platform.isWindows,
+    skip: true,
   );
 }

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

@@ -5,8 +5,6 @@
 @Tags(<String>['flutter-test-driver'])
 library;
 
-import 'dart:io';
-
 import '../integration.shard/test_data/hot_reload_with_asset_test_common.dart';
 import '../src/common.dart';
 
@@ -17,6 +15,6 @@ void main() {
       '--extra-front-end-options=--dartdevc-canary,--dartdevc-module-format=ddc',
     ],
     // https://github.com/flutter/flutter/issues/162567
-    skip: Platform.isWindows,
+    skip: true,
   );
 }

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

@@ -5,8 +5,6 @@
 @Tags(<String>['flutter-test-driver'])
 library;
 
-import 'dart:io';
-
 import '../integration.shard/test_data/stateless_stateful_hot_reload_test_common.dart';
 import '../src/common.dart';
 
@@ -17,6 +15,6 @@ void main() {
       '--extra-front-end-options=--dartdevc-canary,--dartdevc-module-format=ddc',
     ],
     // https://github.com/flutter/flutter/issues/162567
-    skip: Platform.isWindows,
+    skip: true,
   );
 }