Add integration test for change password endpoint

[jacobshandling]

Addresses #16863

• [x] Added/updated tests

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 65.65%. Comparing base (a450bf2) to head (dc97492). Report is 120 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #17319      +/-   ##
==========================================
+ Coverage   65.33%   65.65%   +0.31%     
==========================================
  Files        1188     1190       +2     
  Lines      106506   107536    +1030     
  Branches     2558     2558              
==========================================
+ Hits        69587    70602    +1015     
+ Misses      31600    31575      -25     
- Partials     5319     5359      +40     

Flag	Coverage Δ
backend	66.66% <ø> (+0.33%)	:arrow_up:

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