TestEtcdClientSync is flaky

[rleungx]

Flaky Test

Which jobs are failing

--- FAIL: TestEtcdClientSync (0.86s)
    etcdutil_test.go:185: 
        	Error Trace:	/home/runner/work/pd/pd/pkg/utils/etcdutil/etcdutil_test.go:185
        	Error:      	Received unexpected error:
        	            	[PD:etcd:ErrEtcdMemberRemove]etcdserver: server stopped: etcdserver: server stopped
        	            	github.com/pingcap/errors.AddStack
        	            		/home/runner/go/pkg/mod/github.com/pingcap/errors@v0.11.5-0.20211224045212-9687c2b0f87c/errors.go:174
        	            	github.com/pingcap/errors.(*Error).GenWithStackByCause
        	            		/home/runner/go/pkg/mod/github.com/pingcap/errors@v0.11.5-0.20211224045212-9687c2b0f87c/normalize.go:307
        	            	github.com/tikv/pd/pkg/utils/etcdutil.RemoveEtcdMember
        	            		/home/runner/work/pd/pd/pkg/utils/etcdutil/etcdutil.go:136
        	            	github.com/tikv/pd/pkg/utils/etcdutil.TestEtcdClientSync
        	            		/home/runner/work/pd/pd/pkg/utils/etcdutil/etcdutil_test.go:184
        	            	testing.tRunner
        	            		/opt/hostedtoolcache/go/1.21.9/x64/src/testing/testing.go:1595
        	            	runtime.goexit
        	            		/opt/hostedtoolcache/go/1.21.9/x64/src/runtime/asm_amd64.s:1650
        	Test:       	TestEtcdClientSync

CI link

https://github.com/tikv/pd/actions/runs/8718669939/job/23916391513?pr=8082

Reason for failure (if possible)

Anything else

[lhy1024]

2024-04-23T06:55:55.9231651Z --- FAIL: TestEtcdClientSync (0.88s)
2024-04-23T06:55:55.9232127Z     etcdutil_test.go:199: 
2024-04-23T06:55:55.9232909Z         	Error Trace:	/home/runner/work/pd/pd/pkg/utils/etcdutil/etcdutil_test.go:199
2024-04-23T06:55:55.9233719Z         	Error:      	Received unexpected error:
2024-04-23T06:55:55.9234787Z         	            	[PD:etcd:ErrEtcdMemberRemove]etcdserver: server stopped: etcdserver: server stopped
2024-04-23T06:55:55.9235639Z         	            	github.com/pingcap/errors.AddStack
2024-04-23T06:55:55.9237146Z         	            		/home/runner/go/pkg/mod/github.com/pingcap/errors@v0.11.5-0.20211224045212-9687c2b0f87c/errors.go:174
2024-04-23T06:55:55.9238280Z         	            	github.com/pingcap/errors.(*Error).GenWithStackByCause
2024-04-23T06:55:55.9239879Z         	            		/home/runner/go/pkg/mod/github.com/pingcap/errors@v0.11.5-0.20211224045212-9687c2b0f87c/normalize.go:307
2024-04-23T06:55:55.9241015Z         	            	github.com/tikv/pd/pkg/utils/etcdutil.RemoveEtcdMember
2024-04-23T06:55:55.9242025Z         	            		/home/runner/work/pd/pd/pkg/utils/etcdutil/etcdutil.go:136
2024-04-23T06:55:55.9243000Z         	            	github.com/tikv/pd/pkg/utils/etcdutil.TestEtcdClientSync
2024-04-23T06:55:55.9244077Z         	            		/home/runner/work/pd/pd/pkg/utils/etcdutil/etcdutil_test.go:198
2024-04-23T06:55:55.9244777Z         	            	testing.tRunner
2024-04-23T06:55:55.9245760Z         	            		/opt/hostedtoolcache/go/1.21.9/x64/src/testing/testing.go:1595
2024-04-23T06:55:55.9246460Z         	            	runtime.goexit
2024-04-23T06:55:55.9247287Z         	            		/opt/hostedtoolcache/go/1.21.9/x64/src/runtime/asm_amd64.s:1650
2024-04-23T06:55:55.9247988Z         	Test:       	TestEtcdClientSync

https://github.com/tikv/pd/actions/runs/8796064689/job/24138225547?pr=8116