cli: cockroach node status should show when a node is dead

[pananc]

related to #19924

[CLAassistant]

All committers have signed the CLA.

[cockroach-teamcity]

This change is 

[knz]

Hi @pananc! Thank you for looking into this!

but please

1. insert a space between "cli:" and "cockroach" in your commit message
2. squash all the commits into one before we can merge this. Thank you!

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Reviewed 1 of 1 files at r1, 1 of 1 files at r2.
Review status: all files reviewed at latest revision, all discussions resolved, all commit checks successful.

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Comments from Reviewable

[knz]

Thank you! Very good work!

[pananc]

Thank you!