FI-2783: Turn off Accept Charset Request Header

[vanessuniq]

This branch turn removed the Accept Charset Header from the FHIR Client requests. I also investigated and other http client (Faraday) doesn't automatically set this header.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.71%. Comparing base (9571dff) to head (09c9639).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #620   +/-   ##
=======================================
  Coverage   84.71%   84.71%           
=======================================
  Files         283      283           
  Lines       12401    12402    +1     
  Branches     1503     1503           
=======================================
+ Hits        10505    10506    +1     
  Misses       1888     1888           
  Partials        8        8           

Flag	Coverage Δ
backend	92.33% <100.00%> (+<0.01%)	⬆️
frontend	79.20% <ø> (ø)

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