Add a user to a job's hiring team as a recruiter, sourcer, or coordinator. The user must already exist in your organization and have permission to edit the job. For recruiter and coordinator, pass candidate_responsibility to make this user the responsible owner for active, inactive, future, or all candidates on the job — omitting it leaves new applications without a responsible recruiter or coordinator. This is the V3 replacement for the V1 POST /v1/jobs/{id}/hiring_team flow for these three roles; hiring managers are assigned via POST /v3/job_hiring_managers. To remove a user from the hiring team, call DELETE /v3/job_owners/{id} with the row id returned here.