[BUG] clm: race condition during deleting certain releases created containing the release namespace

Describe the bug

A release containing its own namespace as a dependent object can't be deleted, because the clm finalizer on the release ConfigMap (com.sap.cs.clm.release-<release>) blocks terminating the namespace.

Tested with Version
v0.3.158

To Reproduce
Steps to reproduce the behavior:

1. Choose a source containing a Namespace; for example https://github.com/cert-manager/cert-manager/releases/download/v1.21.0/cert-manager.yaml
2. Install it with --create-namespace (or precreate the namespace manually):

   clm -n cert-manager apply --create-namespace cert-manager /tmp/cert-manager.yaml
   

3. Delete the release:

   clm -n cert-manager delete cert-manager
   

4. Observe the deletion getting stuck. The namespace is in Terminating state, and the only object left is the release ConfigMap.

Expected behavior
The release shot properly be deleted.

Additional context
Maybe some special logic dropping the finalizer earlier if the ConfigMap is the only remaining object in the namespace.