Enable CPU monitor in JupyterLab

Christof Kaufmannrequested to merge
development into master

Some settings were missing to enable the CPU tracking in the resource usage extension. This MR fixes it.

Also some defaults for mem_limit and cpu_limit are now set if environment variables MEM_LIMIT and CPU_LIMIT are not set. However, KubeSpawner will set these environment variables somehow, so the defaults is only useful for local testing with docker or podman.

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