cdc exit after deleting service-gc-safepoint

[wk989898]

How to reproduce

make integration_test CASE=cli_with_auth

Log

[INFO] [client.go:267] ["WatchWithChan exited"] [role=capture-manager]
[WARN] [etcd_watcher.go:71] ["session is disconnected"] [error="[CDC:ErrEtcdSessionDone]the etcd session is done"] [errorVerbose="[CDC:ErrEtcdSessionDone]the etcd session is done\ngithub.com/pingcap/errors.AddStack\n\tgithub.com/pingcap/[email protected]/errors.go:178\ngithub.com/pingcap/errors.(*Error).GenWithStackByArgs\n\tgithub.com/pingcap/[email protected]/normalize.go:175\ngithub.com/pingcap/ticdc/pkg/orchestrator.(*EtcdWorker).Run\n\tgithub.com/pingcap/ticdc/pkg/orchestrator/etcd_worker.go:191\ngithub.com/pingcap/ticdc/server/watcher.(*EtcdWatcher).RunEtcdWorker\n\tgithub.com/pingcap/ticdc/server/watcher/etcd_watcher.go:62\ngithub.com/pingcap/ticdc/server/watcher.(*NodeManager).Run\n\tgithub.com/pingcap/ticdc/server/watcher/module_node_manager.go:157\ngithub.com/pingcap/ticdc/server.(*server).Run.(*server).Run.func2.func3\n\tgithub.com/pingcap/ticdc/server/server.go:184\ngolang.org/x/sync/errgroup.(*Group).Go.func1\n\tgolang.org/x/[email protected]/errgroup/errgroup.go:78\nruntime.goexit\n\truntime/asm_amd64.s:1700"]
[event_service.go:92] ["event service exited"]

[wk989898]

close with #869