TPT-3719: Fixed bug causing deeply nested object lists to be improperly displayed

[ezilber-akamai]

📝 Description

Output of --help would incorrectly display deeply nested lists of objects. For example,

linode-cli lke cluster-create --help showed

--node_pools.taints (JSON, conflicts with children): 
      --node_pools.taints.effect (required): The Kubernetes taint effect.
      --node_pools.taints.key (required): The Kubernetes taint key.
      --node_pools.taints.value (required): The Kubernetes taint value.

instead of

--node_pools.taints (JSON):

✔️ How to Test

Check out this PR locally and run make install

Then run:
make test-unit
make test-int

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