chore: fix runner custom test

What does this MR do?

Fixes runner custom verify test. The reason why it was failing is that, when the custom values are applied, a second pod is created, so when checking the annotation for this new pod, the response of the annotation with the current command will be the two annotations for the first and the second.

I'm changing this script to check simply that the second annotation exists independently if the first annotation is being returned or not.

Screenshots / Other relevant info

Related issues: #18 (comment 322921627)

Succeeded job: https://gitlab.com/gitlab-org/cluster-integration/cluster-applications/-/jobs/629984655

Manual QA

• Test this change using a Cluster management project