Skip _db prefix on /_open/auth

[apetenchea]

Using _db/{db_name}/_open/auth is obsolete. We should simply use /_open/auth instead.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.54%. Comparing base (8e6aaca) to head (7ca68ce).
Report is 20 commits behind head on main.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #374      +/-   ##
==========================================
- Coverage   95.94%   94.54%   -1.41%     
==========================================
  Files          26       26              
  Lines        4296     4324      +28     
==========================================
- Hits         4122     4088      -34     
- Misses        174      236      +62     

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