bug: workspace deletion block ws tree command across all levels

[MuneebAijaz]

Describe the bug

If any of the workspaces is in deletion, it will throw errors on kubectl ws tree command on all levels.

Error: forbidden: User "" cannot get path "/clusters/root:parent-0:child-0/apis/tenancy.kcp.io/v1alpha1/workspaces": workspace access not permitted

Steps To Reproduce

1. Create a workspace parent inside root workspace
2. Create another workspace child inside the newly created parent workspace
3. Delete the child workspace
4. While its deleting, go back to the root workspace, and try kubectl ws tree

Expected Behaviour

kubectl ws tree should be functional at all levels despite deletion of any workspace

Additional Context

No response