Increase timeout for asyncEval tests on Windows CI

Author: khanak0509

packages/devtools_app/test/shared/eval_integration_test.dart

@@ -69,7 +69,7 @@ void main() {
           ))!;
           expect(instance2.classRef!.name, '_Future');
         },
-        timeout: const Timeout.factor(2),
+        timeout: const Timeout.factor(8),
         // TODO(https://github.com/flutter/devtools/issues/6998): if this flake
         // is addressed, we can unskip this for the Flutter customer tests.
         tags: skipForCustomerTestsTag,
@@ -98,7 +98,7 @@ void main() {
 
           expect(instance.valueAsString, '42');
         },
-        timeout: const Timeout.factor(2),
+        timeout: const Timeout.factor(8),
         // TODO(https://github.com/flutter/devtools/issues/6998): if this flake
         // is addressed, we can unskip this for the Flutter customer tests.
         tags: skipForCustomerTestsTag,
@@ -150,7 +150,7 @@ void main() {
           );
           expect(error.valueAsString, 'foo');
         },
-        timeout: const Timeout.factor(2),
+        timeout: const Timeout.factor(8),
         // TODO(https://github.com/flutter/devtools/issues/6998): if this flake
         // is addressed, we can unskip this for the Flutter customer tests.
         tags: skipForCustomerTestsTag,