fix: don't force server errors in legacy server

[muhlemmer]

This PR changes the way we re-throw errors. In the old solution, the Legacy Server used NewStatusError which forces a particular HTTP status code, even if one was already set from downstream. Instead now we us AsStatusError. This only sets a status code if one wasn't set already.

The WriteError function is also rewritten to make better distinction between error types and status codes.

Related: #291

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[codecov]

Codecov Report

Attention: 10 lines in your changes are missing coverage. Please review.

Comparison is base (844e233) 59.96% compared to head (cf5a6e9) 60.03%.

Files	Patch %	Lines
pkg/op/auth_request.go	0.00%	5 Missing ⚠️
pkg/op/server_legacy.go	0.00%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #517      +/-   ##
==========================================
+ Coverage   59.96%   60.03%   +0.06%     
==========================================
  Files          80       80              
  Lines        6981     6993      +12     
==========================================
+ Hits         4186     4198      +12     
  Misses       2498     2498              
  Partials      297      297              

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[github-actions]

🎉 This PR is included in version 3.10.2 🎉

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