feat: Add support for Copilot usage metrics reports API

[henriklundstrom]

Implements the new endpoints for retrieving reports of copilot metrics for enterprises and organizations. See https://docs.github.com/en/enterprise-cloud@latest/rest/copilot/copilot-usage-metrics?apiVersion=2022-11-28. The API does not return the reports directly, but rather returns signed download URLs with a limited expiration time. The proposed implementation simply returns the API response, leaving the actual downloading of the reports to the user.

Will require an update to the openapi_operations.yaml-file.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.44%. Comparing base (c06e8a9) to head (70c494c).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@ Coverage Diff @@## master #3893 +/- ##
==========================================
+ Coverage 92.39% 92.44% +0.04% 
==========================================
Files 203 203 Lines 14833 14925 +92 ==========================================
+ Hits 13705 13797 +92 
Misses 926 926 Partials 202 202 

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[gmlewis]

Will require an update to the openapi_operations.yaml-file.

Thank you, @henriklundstrom! I've updated the openapi_operations.yaml file in #3895.
If you merge master into this PR and push the result, then fix the linting errors, we should be ready to review this PR.

[henriklundstrom]

Will require an update to the openapi_operations.yaml-file.

Thank you, @henriklundstrom! I've updated the openapi_operations.yaml file in #3895. If you merge master into this PR and push the result, then fix the linting errors, we should be ready to review this PR.

Thanks, I've merged the latest master into this branch.

[gmlewis]

Thank you, @henriklundstrom!
LGTM.
Awaiting second LGTM+Approval from any other contributor to this repo before merging.

cc: @stevehipwell - @alexandear - @zyfy29

[gmlewis]

Thank you, @henriklundstrom and @alexandear!
Merging.