Change the App dependency with Server in migrations package (#14804)

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

app/server.go

@@ -1290,4 +1290,7 @@ func (s *Server) initJobs() {
 	if jobsBleveIndexerInterface != nil {
 		s.Jobs.BleveIndexer = jobsBleveIndexerInterface(s)
 	}
+	if jobsMigrationsInterface != nil {
+		s.Jobs.Migrations = jobsMigrationsInterface(s)
+	}
 }