In TektonAddon Finalizer, the tektonInstallerSet deletion is still done using a list of names from TektonAddon Status. We should be using lableSelectors to do a List query and then delete. (https://github.com/tektoncd/operator/blob/a0cd67e5c428babf1f76316a14cf9c4526055cab/pkg/reconciler/openshift/tektonaddon/tektonaddon.go#L93)

Eg: https://github.com/tektoncd/operator/blob/a0cd67e5c428babf1f76316a14cf9c4526055cab/pkg/reconciler/kubernetes/tektonpipeline/tektonpipeline.go#L100

Acceptance Criteria

• all Finalizer logic uses labelSelector based list queries to find related InstallerSets