FI-3511: Fix json handling

[Jammjammjamm]

Summary

This branch fixes an issue where suite endpoints recognize requests with a content type of application/json as json and automatically parse the bodies, but don't recognize application/fhir+json as json.

Testing Guidance

This will be difficult to manually test, but if you check out b900d28216862e32b2dd3e955dfb49ebeea342f6 you can verify that the unit test for application/fhir+json fails prior to the fix.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.37%. Comparing base (15eb38c) to head (20a56a2).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #568      +/-   ##
==========================================
+ Coverage   83.94%   84.37%   +0.43%     
==========================================
  Files         263      265       +2     
  Lines       11460    11475      +15     
  Branches     1261     1261              
==========================================
+ Hits         9620     9682      +62     
+ Misses       1830     1783      -47     
  Partials       10       10              

Flag	Coverage Δ
backend	93.34% <100.00%> (+1.14%)	⬆️
frontend	79.15% <ø> (ø)

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