kubespawner prints out the pods environment variables for a specific error

[michael-robbins]

Bug description

Logging in kubespawner prints out all environment variables on error. This includes sensitive values like the singleuser's API token and any other secrets being passed into the users pod.

https://github.com/jupyterhub/kubespawner/blob/main/kubespawner/spawner.py#L2745

Expected behaviour

Environment variables are not printed out/included in the logs.

Actual behaviour

Environment variables are printed out including anything sensitive.

How to reproduce

Have kubespawner fail to create a pod and enter a timeout exception, this will cause the logging line to fire.

Your personal set up

N/A

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