TestUpdateDefaultReplicaConfig is unstable

[lhy1024]

Flaky Test

Which jobs are failing

2023-11-22T04:57:42.1796276Z --- FAIL: TestConfigTestSuite (78.16s)
2023-11-22T04:57:42.1796660Z     --- FAIL: TestConfigTestSuite/TestUpdateDefaultReplicaConfig (32.09s)
2023-11-22T04:57:42.1796932Z         testutil.go:264: start to run test in pd mode
2023-11-22T04:57:42.1797201Z         testutil.go:268: finish to run test in pd mode
2023-11-22T04:57:42.1797461Z         testutil.go:273: start to run test in api mode
2023-11-22T04:57:42.1797626Z         testutil.go:64: 
2023-11-22T04:57:42.1798125Z             	Error Trace:	/home/runner/work/pd/pd/pkg/utils/testutil/testutil.go:64
2023-11-22T04:57:42.1798830Z             	            				/home/runner/work/pd/pd/tests/pdctl/config/config_test.go:690
2023-11-22T04:57:42.1799534Z             	            				/home/runner/work/pd/pd/tests/pdctl/config/config_test.go:754
2023-11-22T04:57:42.1800190Z             	            				/home/runner/work/pd/pd/tests/testutil.go:277
2023-11-22T04:57:42.1800736Z             	            				/home/runner/work/pd/pd/tests/testutil.go:259
2023-11-22T04:57:42.1801427Z             	            				/home/runner/work/pd/pd/tests/pdctl/config/config_test.go:668
2023-11-22T04:57:42.1801692Z             	Error:      	Condition never satisfied
2023-11-22T04:57:42.1802082Z             	Test:       	TestConfigTestSuite/TestUpdateDefaultReplicaConfig

CI link

https://github.com/tikv/pd/actions/runs/6953034173/job/18917553194

Reason for failure (if possible)

Anything else

[lhy1024]

https://github.com/tikv/pd/actions/runs/6955578083/job/18924625942

[lhy1024]

https://github.com/tikv/pd/actions/runs/6969873968/job/18966672469

[HuSharp]

https://github.com/tikv/pd/actions/runs/9558313749/job/26346831269?pr=8301 meet again

2024-06-18T03:12:21.6185574Z     testutil.go:67: 
2024-06-18T03:12:21.6186208Z         	Error Trace:	/home/runner/work/pd/pd/pkg/utils/testutil/testutil.go:67
2024-06-18T03:12:21.6187423Z         	            				/home/runner/work/pd/pd/tools/pd-ctl/tests/config/config_test.go:952
2024-06-18T03:12:21.6188708Z         	            				/home/runner/work/pd/pd/tools/pd-ctl/tests/config/config_test.go:1020
2024-06-18T03:12:21.6189701Z         	            				/home/runner/work/pd/pd/tests/testutil.go:353
2024-06-18T03:12:21.6190509Z         	            				/home/runner/work/pd/pd/tests/testutil.go:314
2024-06-18T03:12:21.6191768Z         	            				/home/runner/work/pd/pd/tools/pd-ctl/tests/config/config_test.go:936
2024-06-18T03:12:21.6192117Z         	Error:      	Condition never satisfied
2024-06-18T03:12:21.6192653Z         	Test:       	TestConfigTestSuite/TestUpdateDefaultReplicaConfig