fix(server): Log x-forwarded-for header in traces

[nellh]

Enables logging the x-forwarded-for header in Sentry traces.

[codecov]

Codecov Report

❌ Patch coverage is 7.69231% with 12 lines in your changes missing coverage. Please review.
✅ Project coverage is 42.82%. Comparing base (29d7248) to head (200292f).
⚠️ Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
...es/openneuro-server/src/libs/authentication/jwt.ts	7.69%	12 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3738      +/-   ##
==========================================
- Coverage   42.83%   42.82%   -0.02%     
==========================================
  Files         641      641              
  Lines       34401    34413      +12     
  Branches     1548     1548              
==========================================
+ Hits        14735    14736       +1     
- Misses      19527    19538      +11     
  Partials      139      139              

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