fix: Log authorization callback errors

[hoxbro]

So a warning is emitted if something goes wrong in the authentication callback.

Also, set the status code if no auth fails to 403.

[codecov]

Codecov Report

Attention: Patch coverage is 95.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 82.30%. Comparing base (c06f779) to head (c3b3f8c).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
panel/io/server.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7463   +/-   ##
=======================================
  Coverage   82.30%   82.30%           
=======================================
  Files         338      338           
  Lines       50819    50838   +19     
=======================================
+ Hits        41825    41843   +18     
- Misses       8994     8995    +1     

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