[FEAT] - e2e test for Cluster lifecycle

[IvoGoman]

Priority

(Medium) I'm annoyed but I'll live

Description

This e2e test ensures that

• remote cluster resource is onboarded
• Plugin deployment to check remote resources
• cluster offboarding
• resources on the remote cluster are removed
• secret for the cluster is deleted

Reference Issues

No response

[uwe-mayer]

braindump: We should test deletion of deployed Plugins in conjunction with cluster deletion doesn't get stuck (we had a case)

• Delete first Plugin then Cluster
• Delete first Cluster then Plugin