CLI also skips authcode prompt when PINNIPED_SKIP_PRINT_LOGIN_URL=true

[cfryanr]

Follow-up to #1897 to make the CLI also skip printing the authcode prompt when PINNIPED_SKIP_PRINT_LOGIN_URL=true. This allows the use of PINNIPED_SKIP_PRINT_LOGIN_URL=true with the Pinniped Supervisor (and other OIDC providers who use response_mode=form_post), which would have prompted for the authcode before this PR, potentially corrupting a console-based UI like k9s.

Release note:

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 29.39%. Comparing base (c494add) to head (c86a615).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1938   +/-   ##
=======================================
  Coverage   29.39%   29.39%           
=======================================
  Files         350      350           
  Lines       58518    58513    -5     
=======================================
- Hits        17203    17202    -1     
+ Misses      40800    40797    -3     
+ Partials      515      514    -1     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.