CLI-1294: [auth:logout] warning when key is invalid

[danepowell]

@anavarre I'm trying to emphasize the self-help instructions for known exceptions by adding a bold "How to fix it" header, since it's otherwise easy to overlook. How do you feel about this?

For general exceptions where we can't offer specific help, you get just the second and third sentences about docs and support.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.41%. Comparing base (72cdee2) to head (86b0ce4).

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #1716   +/-   ##
=========================================
  Coverage     91.40%   91.41%           
- Complexity     1800     1805    +5     
=========================================
  Files           121      121           
  Lines          6458     6465    +7     
=========================================
+ Hits           5903     5910    +7     
  Misses          555      555           

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[anavarre]

This LGTM. The only thing that I'm unsure of is how it renders with different terminal schemes. I don't see a Phar attached so I can't try it out ATM. Can be dealt with in a different PR as needed.