confighttp: Ensure that auth errors use provided error handler

[noctchillin]

Description

OTLP/HTTP receiver does not encode authentication errors into a Status object, and as such not expose a developer facing error message in the Status.mesage field. - https://opentelemetry.io/docs/specs/otlp/#failures-1

Resolves this issue by handling authentication errors with the same error handler provided to the Server.

Link to tracking issue

Fixes #12666

Testing

Unit tests for handling errors with and without a server error handler

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: noctchillin / name: Andrew Toscano (383ee59, 63d26a4, 79908c6, db162f3, a0b10cf, 6191a4e)
• ✅ login: mx-psi / name: Pablo Baeyens (25902d8)

[noctchillin]

I noticed there may be a conflict with an existing PR #12702 , but I wanted to make sure that this issue was brought up before the refactoring, let me know if there are any further changes I need to make.

[jmacd]

Yes, @bogdandrutu please take a look.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.42%. Comparing base (564818f) to head (25902d8).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #12714      +/-   ##
==========================================
- Coverage   91.43%   91.42%   -0.01%     
==========================================
  Files         487      487              
  Lines       26808    26811       +3     
==========================================
+ Hits        24511    24512       +1     
- Misses       1814     1815       +1     
- Partials      483      484       +1     

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