chore: extend timeout for hotswap test (#31559)

Out of our last 6 pipeline failures, 4 were:

```console
hotswap deployment for ecs service detects failed deployment and errors
    Timeout: test took more than 600s to complete
```

This is sporadic, so i'm trying to make it more stable by extending the timeout, which will now be 1800s.

https://github.com/aws/aws-cdk/blob/16b74f337e351b177aaeed2d80c519ff264c3e11/packages/%40aws-cdk-testing/cli-integ/lib/with-cdk-app.ts#L16-L17

----

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

packages/@aws-cdk-testing/cli-integ/tests/cli-integ-tests/cli.integtest.ts

@@ -2185,7 +2185,7 @@ integTest(
 
 integTest(
   'hotswap deployment for ecs service detects failed deployment and errors',
-  withDefaultFixture(async (fixture) => {
+  withExtendedTimeoutFixture(async (fixture) => {
     // GIVEN
     await fixture.cdkDeploy('ecs-hotswap');