[MM-32521] remove local socket file if it already exists (#16945)

* remove socket file if it exists

* reflect review comments

app/server.go

@@ -1182,6 +1182,10 @@ func (s *Server) startLocalModeServer() error {
 	}
 
 	socket := *s.configStore.Get().ServiceSettings.LocalModeSocketLocation
+	if err := os.RemoveAll(socket); err != nil {
+		return errors.Wrapf(err, utils.T("api.server.start_server.starting.critical"), err)
+	}
+
 	unixListener, err := net.Listen("unix", socket)
 	if err != nil {
 		return errors.Wrapf(err, utils.T("api.server.start_server.starting.critical"), err)