Change check of Kubernetes annotation for Keycloak resource binding

[gtroitsk]

Summary

After adding Kubernetes support in #1083, tests that uses KeycloakContainer start to fail on bare metal because of java.lang.NoClassDefFoundError: io/quarkus/test/scenarios/KubernetesScenario.
Ideally we don't want to add quarkus-test-kubernetes dependency in each test module, so the next workaround is provided in this PR

Please check the relevant options

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Dependency update
• Refactoring
• Breaking change (fix or feature that would cause existing functionality to change)
• This change requires a documentation update
• This change requires execution against OCP (use run tests phrase in comment)
• This change requires execution against K8s (use run kube tests phrase in comment)

Checklist:

• Example scenarios has been updated / added
• Methods and classes used in PR scenarios are meaningful
• Commits are well encapsulated and follow the best practices

[gtroitsk]

run kube tests

[michalvavrik]

lgtm