Add internal secret to save state between creation and deletion steps

[lucj]

This is similar to what has been done for the redis-cloud service. It uses a secret to store the name of the cluster created by the create.sh script. This is useful to make sure the deletion step actually delete the correct cluster (this is a way to avoid the deletion of an existing cluster with the same name)

[lucj]

Closing that one as additional changes will be done in new PR