TestLegacyTSOServer is flaky

[wuhuizuo]

Bug Report

I create a PR without any code changes, but the integration CI job "PD Test / chunks (8, TSO Integration Test) (pull_request) " failed:

[remote-peer-cluster-id=92a8a50d4bd1be75] [local-member-id=90978eff05ad95e7] [local-member-cluster-id=fa7dba492a46a30c] [error="cluster ID mismatch"]
    server_test.go:78: 
        	Error Trace:	/home/runner/work/pd/pd/tests/integrations/tso/server_test.go:78
        	            				/home/runner/go/pkg/mod/github.com/stretchr/testify@v1.8.4/suite/suite.go:154
        	            				/home/runner/work/pd/pd/tests/integrations/tso/server_test.go:55
        	Error:      	Received unexpected error:
        	            	Etcd cluster ID mismatch, expect 18049787704975467[276](https://github.com/tikv/pd/actions/runs/10734113227/job/29768683433?pr=8598#step:4:277), got 10567878002150063733
        	            	github.com/tikv/pd/pkg/utils/etcdutil.CheckClusterID
        	            		/home/runner/work/pd/pd/pkg/utils/etcdutil/etcdutil.go:102
        	            	github.com/tikv/pd/server.(*Server).startEtcd
        	            		/home/runner/work/pd/pd/server/server.go:343
        	            	github.com/tikv/pd/server.(*Server).Run
        	            		/home/runner/work/pd/pd/server/server.go:619
        	            	github.com/tikv/pd/tests.(*TestServer).Run
        	            		/home/runner/work/pd/pd/tests/cluster.go:127
        	            	github.com/tikv/pd/tests.RunServer.func1
        	            		/home/runner/work/pd/pd/tests/cluster.go:577
        	            	runtime.goexit
        	            		/opt/hostedtoolcache/go/1.21.13/x64/src/runtime/asm_amd64.s:1650
        	            	github.com/tikv/pd/tests.RunServers
        	            		/home/runner/work/pd/pd/tests/cluster.go:589
        	            	github.com/tikv/pd/tests.(*TestCluster).RunInitialServers
        	            		/home/runner/work/pd/pd/tests/cluster.go:601
        	            	github.com/tikv/pd/tests/integrations/tso.(*tsoServerTestSuite).SetupSuite
        	            		/home/runner/work/pd/pd/tests/integrations/tso/server_test.go:77
        	            	github.com/stretchr/testify/suite.Run
        	            		/home/runner/go/pkg/mod/github.com/stretchr/testify@v1.8.4/suite/suite.go:154
        	            	github.com/tikv/pd/tests/integrations/tso.TestLegacyTSOServer
        	            		/home/runner/work/pd/pd/tests/integrations/tso/server_test.go:55
        	            	testing.tRunner
        	            		/opt/hostedtoolcache/go/1.21.13/x64/src/testing/testing.go:1595
        	            	runtime.goexit
        	            		/opt/hostedtoolcache/go/1.21.13/x64/src/runtime/asm_amd64.s:1650
        	Test:       	TestLegacyTSOServer
--- FAIL: TestLegacyTSOServer (2.25s)
FAIL

• Run record: https://github.com/tikv/pd/actions/runs/10734113227/attempts/1?pr=8598