feat: kubectl-hns describe to show AllowCascadingDeletion flag

[manjinder-mckc]

Fixes Issues: #319 #303

Enhances describe command in kubectl hns plugin to also show AllowCascadingDeletion flag.

$ kubectl hns describe boss                             
Hierarchy configuration for namespace boss
  Parent:  bigboss
  Children:
  - workers (subnamespace)
  Allows Cascading Deletion: true
  No conditions

Tested: Added test; verified that the test failed before the change and passed after it; ran e2e tests; also tested by hand on local cluster.

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: manjinder-mckc / name: Manjinder (815bb27)

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[rjbez17]

/ok-to-test
/lgtm

[rjbez17]

Thanks for this, great addition

[rjbez17]

/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: manjinder-mckc, rjbez17

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