feat: Add concurrent backups configuration to backup reconciler

Co-authored-by: aider (gemini/gemini-2.5-pro) <aider@aider.chat>
Signed-off-by: Scott Seago <sseago@redhat.com>

pkg/cmd/server/server.go

@@ -669,6 +669,7 @@ func (s *server) runControllers(defaultVolumeSnapshotLocations map[string]string
 			s.config.MaxConcurrentK8SConnections,
 			s.config.DefaultSnapshotMoveData,
 			s.config.ItemBlockWorkerCount,
+			s.config.ConcurrentBackups,
 			s.crClient,
 		).SetupWithManager(s.mgr); err != nil {
 			s.logger.Fatal(err, "unable to create controller", "controller", constant.ControllerBackup)