Populate headers from config differently

[tdabasinskas]

Seems that .String() adds additional quotes on the string it returns. We should use StringValue(), but it's not available on the elements. ElementsAs() should resolve this.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.34%. Comparing base (d270781) to head (5826951).
Report is 161 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #79      +/-   ##
==========================================
+ Coverage   73.67%   74.34%   +0.67%     
==========================================
  Files          11       11              
  Lines        1603     1602       -1     
==========================================
+ Hits         1181     1191      +10     
+ Misses        335      326       -9     
+ Partials       87       85       -2     

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