Includes commit stats in POST project commits API

What does this MR do?

In this commit we optionally removed the commit stats from the API using a stats param, but we forgot to pass the stats param in the POST /projects/:id/repository/commits API, therefore we don't return the stats any longer.

With this MR we pass correctly the stats param and correctly return the stats in the response.

What are the relevant issue numbers?

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• Tests added for this feature/bug
• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• Conforms to the database guides

Closes #51803 (closed)