Fix copilot API payload

[zetaab]

small fix to #2973

cc @gmlewis @o-sama

[gmlewis]

Investigating why tests are failing...

[gmlewis]

Oh, I see... the unit tests need updating.
@zetaab - please make sure unit tests pass on your side... then push the changes (not force-push) to this PR to fix them.
Please see CONTRIBUTING.md step 4 for details. Thanks.

[gmlewis]

Thank you, @zetaab !

Let's please keep the struct field names matching the JSON field tag names.

I'm not going to mark this as a Breaking API change since this was just introduced within this major version.

[gmlewis]

Thank you, @zetaab !
LGTM.
Merging after tests pass.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (9d6658a) 97.71% compared to head (af72ec5) 97.71%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3034   +/-   ##
=======================================
  Coverage   97.71%   97.71%           
=======================================
  Files         152      152           
  Lines       13241    13241           
=======================================
  Hits        12939    12939           
  Misses        213      213           
  Partials       89       89           

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