Return recipient for letter uploads

If your caseworking system always spits out files with the same name it
will be hard to differentiate them when looking at the uploads page.

Seeing who the letter was sent to will help you differentiate them.

We can’t do this until the API returns the recipient.

app/dao/uploads_dao.py

@@ -30,7 +30,8 @@ def dao_get_uploads_by_service_id(service_id, limit_days=None, page=1, page_size
         Job.scheduled_for.label("scheduled_for"),
         Job.processing_started.label('processing_started'),
         Job.job_status.label("status"),
-        literal('job').label('upload_type')
+        literal('job').label('upload_type'),
+        literal(None).label('recipient'),
     ).join(
         Template, Job.template_id == Template.id
     ).filter(
@@ -58,7 +59,8 @@ def dao_get_uploads_by_service_id(service_id, limit_days=None, page=1, page_size
         # letters don't have a processing_started date but we want created_at to be used for sorting
         Notification.created_at.label('processing_started'),
         Notification.status,
-        literal('letter').label('upload_type')
+        literal('letter').label('upload_type'),
+        Notification.to.label('recipient'),
     ).join(
         Template, Notification.template_id == Template.id
     ).filter(