`skupper version` shows no information if the cluster is unreacheable

[hash-d]

Describe the bug

If $KUBECONFIG is set (or ~/.kube/config exists) and its configured cluster is inaccessible, the skupper version command returns an empty output.

$ skupper version
COMPONENT	VERSION
$

How To Reproduce

Pick an existing kubeconfig file and change its server key to a closed port on localhost, such as 1234.

Then execute the skupper version command and inspect the output.

$ skupper version
COMPONENT	VERSION
$ grep server $KUBECONFIG 
    server: https://localhost:1234

Expected behavior

This needs to be worked in light of #2019:

• if the intention is to show the running versions, an error message should be shown stating that the operation cannot be completed, as the cluster is not accessible.
• for baked-in images and environment variables, the command should return its information, in full, as it does not depend on the cluster.

Environment details

• Skupper CLI: 2.0.0
• Skupper Operator (if applicable): Not applicable
• Platform: Not applicable

Additional context Not applicable