Rename property to more accurately describe purpose

`recently_created` says it would just be looking at the `created_at`
field to see if it's been created recently. Technically this method
isn't doing that, whilst its behaviour would be similar, it's actually
different and maybe therefore a bit misleading.

app/models/job.py

@@ -107,7 +107,7 @@ class Job(JSONModel):
         return self.notification_count == self.notifications_sent
 
     @property
-    def recently_created(self):
+    def awaiting_processing_or_recently_processed(self):
         if not self.processing_started:
             # Assume that if processing hasn’t started yet then the job
             # must have been created recently enough to not have any