Add test for changing password of local user

[denisonbarbosa]

This test ensures that authd does not interfere when changing the password of a local user.

UDENG-9558

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.20%. Comparing base (c53898d) to head (d32434d).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1407      +/-   ##
==========================================
+ Coverage   87.10%   87.20%   +0.09%     
==========================================
  Files          93       93              
  Lines        6369     6369              
  Branches      111      111              
==========================================
+ Hits         5548     5554       +6     
+ Misses        765      759       -6     
  Partials       56       56              

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