Update to use new auth client

[MrCreosote]

Some clunky stuff in there to match the behavior of the old auth client which defaults to prod if no url is supplied.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 71.47%. Comparing base (40b3397) to head (941af46).
⚠️ Report is 14 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #174      +/-   ##
============================================
- Coverage     71.85%   71.47%   -0.38%     
  Complexity      691      691              
============================================
  Files            46       45       -1     
  Lines          3716     3656      -60     
  Branches        657      657              
============================================
- Hits           2670     2613      -57     
+ Misses          812      809       -3     
  Partials        234      234              

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