[#noissue] Add ErrorMockController for error page testing

[intr3p1d]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 20 lines in your changes missing coverage. Please review.

Project coverage is 36.99%. Comparing base (c42084f) to head (325fd60).
Report is 11 commits behind head on master.

Files	Patch %	Lines
...p/pinpoint/web/controller/ErrorMockController.java	0.00%	20 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #11208      +/-   ##
============================================
- Coverage     37.03%   36.99%   -0.04%     
+ Complexity    12052    12046       -6     
============================================
  Files          3974     3980       +6     
  Lines         97808    97888      +80     
  Branches      10410    10415       +5     
============================================
- Hits          36219    36210       -9     
- Misses        58615    58704      +89     
  Partials       2974     2974              

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