TestResignTSOPrimaryForward is flaky

[okJiang]

Flaky Test

Which jobs are failing

server_test.go:234: 
        	Error Trace:	/home/runner/work/pd/pd/tests/integrations/mcs/tso/server_test.go:234
        	            				/home/runner/work/pd/pd/tests/integrations/mcs/tso/server_test.go:323
        	Error:      	Received unexpected error:
        	            	[PD:etcd:ErrStartEtcd]listen tcp 127.0.0.1:39627: bind: address already in use: listen tcp 127.0.0.1:39627: bind: address already in use
        	            	github.com/pingcap/errors.AddStack
        	            		/home/runner/go/pkg/mod/github.com/pingcap/[email protected]/errors.go:174
        	            	github.com/pingcap/errors.(*Error).GenWithStackByCause
        	            		/home/runner/go/pkg/mod/github.com/pingcap/[email protected]/normalize.go:307
        	            	github.com/tikv/pd/server.(*Server).startEtcd
        	            		/home/runner/work/pd/pd/server/server.go:329
        	            	github.com/tikv/pd/server.(*Server).Run
        	            		/home/runner/work/pd/pd/server/server.go:618
        	            	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/1.23.2/x64/src/runtime/asm_amd64.s:1700
        	            	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/mcs/tso.NewAPIServerForward
        	            		/home/runner/work/pd/pd/tests/integrations/mcs/tso/server_test.go:233
        	            	github.com/tikv/pd/tests/integrations/mcs/tso.TestResignTSOPrimaryForward
        	            		/home/runner/work/pd/pd/tests/integrations/mcs/tso/server_test.go:323
        	            	testing.tRunner
        	            		/opt/hostedtoolcache/go/1.23.2/x64/src/testing/testing.go:[169](https://github.com/tikv/pd/actions/runs/11454903722/job/31869908930?pr=8732#step:4:170)0
        	            	runtime.goexit
        	            		/opt/hostedtoolcache/go/1.23.2/x64/src/runtime/asm_amd64.s:[170](https://github.com/tikv/pd/actions/runs/11454903722/job/31869908930?pr=8732#step:4:171)0
        	Test:       	TestResignTSOPrimaryForward
--- FAIL: TestResignTSOPrimaryForward (0.15s)

CI link

https://github.com/tikv/pd/actions/runs/11454903722/job/31869908930?pr=8732

Reason for failure (if possible)

Anything else

[rleungx]

the same as #8726