cli: remove network from quota status output

[tgross]

As reported in #9920 (comment)

Network quotas were removed in Nomad 1.0.4. Remove the fields no longer in use
from the quota status output.

---

This PR won't run the test here because it's in the OSS repo, but I've verified the test passes locally in the ENT repo. Adding a fmt.Println to the test in the appropriate spot shows the following new output:

Name        = test
Description = <none>
Limits      = 1

Quota Limits
Region  CPU Usage  Memory Usage  Memory Max Usage  Variables Usage
global  0 / 100    0 / inf       0 / inf           0 / inf

[jrasell]

LGTM!

[github-actions]

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