[#67563060] Job ownership should be transfered to workspace owner on user deletion

 - Validate that jobs have an owner who is a member of the workspace.
 - When a user is deleted transfer ownership of any owned jobs to the owner of the job's workspace
 - Include support for changing job owner in the api. Param owner_id can be passed as an admin, workspace
   owner, or job owner to change a job's owner to another workspace member