KubernetesAddOnTest starts test containers even with devservices disabled in application properties

Our CI is complaining about timeouts from time to time because the Kubernetes Client library tries to start testcontainers to have a Kubernetes cluster available in devmode.

The problem is that the extension is not reading from the application properties in the classpath, we have to configure the test to disable it explicitly. Also, we can review the other usages of this extension in the project to disable them all.