chore(request): mutualize GH API headers

[aduh95]

Removes a bunch a duplicated code, and makes it easier to spot when we're not using default headers

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.93%. Comparing base (5034b4f) to head (4ab6c0e).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1046   +/-   ##
=======================================
  Coverage   80.93%   80.93%           
=======================================
  Files          39       39           
  Lines        4841     4841           
=======================================
  Hits         3918     3918           
  Misses        923      923           

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