Add endpoint to redirect from contact list to send

In order to use a contact list we’re going to put you in the normal
upload a spreadsheet journey. Except without having to upload again.

So this commit adds an endpoint that takes the file from the contact
list bucket, puts it in the same place it would have gone if you’d
uploaded it, then sends you on your way.

app/models/contact_list.py

@@ -51,6 +51,22 @@ class ContactList(JSONModel):
             bucket=ContactList.get_bucket_name(),
         )
 
+    @staticmethod
+    def copy_to_uploads(service_id, upload_id):
+        contents = ContactList.download(service_id, upload_id)
+        metadata = ContactList.get_metadata(service_id, upload_id)
+        new_upload_id = s3upload(
+            service_id,
+            contents,
+            current_app.config['AWS_REGION'],
+        )
+        set_metadata_on_csv_upload(
+            service_id,
+            new_upload_id,
+            **metadata,
+        )
+        return new_upload_id
+
     @classmethod
     def create(cls, service_id, upload_id):