fix(controller): use ownerreferences without controller owner relation

[oliverbaehler]

This changes the fundamental behavior regarding namespace reconcilation. I stumbeled across this while automating against a platform, which creates namespaces for each cluster and adds controller references to the namespace. Since you can only have one controller reference per namespace, such a setup won't work.

With this change, instead of reconciling on the namespaces which are owned by the controller, we reconcile all the namespaces which have a tenant ownerreference.

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[prometherion]

LGTM, I'd say the controller reference here is more correct compared to the owner reference since we're not generating the object upon the Tenant creation.