chore: Delete createApiErrorMocks

[wrt95]

Description

• Not used anywhere so it is deleted.

Related Issue(s)

• Delete apiErrorMocks #13873

Verification

• Your code builds clean without any errors or warnings
• Manual testing done (required)
• Relevant automated test added (if you find this hard, leave it and we'll help out)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.29%. Comparing base (9ec0e3b) to head (55f954f).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #13913   +/-   ##
=======================================
  Coverage   95.29%   95.29%           
=======================================
  Files        1653     1653           
  Lines       22030    22030           
  Branches     2594     2594           
=======================================
  Hits        20994    20994           
  Misses        790      790           
  Partials      246      246           

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