Disable flaky tests on windows (#1751)

* Disable failing tests

* Disable flaky test on windows

Author: Anna Gringauze

dwds/test/chrome_proxy_service_test.dart

@@ -1041,7 +1041,9 @@ void main() {
 
       test('throws if not paused', () async {
         await expectLater(service.getStack(isolateId!), throwsRPCError);
-      });
+      },
+          skip: Platform
+              .isWindows); // Issue: https://github.com/dart-lang/webdev/issues/1749
 
       /// Support function for pausing and returning the stack at a line.
       Future<Stack> breakAt(String breakpointId, {int? limit}) async {