TestConfigTTL is unstable

[HuSharp]

Flaky Test

TestConfigTestSuite/TestConfigTTL

Which jobs are failing

2023-12-27T09:39:08.9599953Z --- FAIL: TestConfigTestSuite (17.87s)
2023-12-27T09:39:08.9600879Z     testutil.go:275: start test TestConfigAll in pd mode
2023-12-27T09:39:08.9623546Z     testutil.go:305: start test TestConfigAll in api mode
2023-12-27T09:39:08.9714144Z     --- FAIL: TestConfigTestSuite/TestConfigAll (7.25s)
2023-12-27T09:39:08.9715854Z         config_test.go:180: 
2023-12-27T09:39:08.9719011Z             	Error Trace:	/home/runner/work/pd/pd/tests/server/config/config_test.go:180
2023-12-27T09:39:08.9816187Z             	            				/home/runner/work/pd/pd/tests/testutil.go:309
2023-12-27T09:39:08.9818344Z             	            				/home/runner/work/pd/pd/tests/testutil.go:270
2023-12-27T09:39:08.9820589Z             	            				/home/runner/work/pd/pd/tests/server/config/config_test.go:104
....
....
2023-12-27T09:39:09.0682609Z             	            	
2023-12-27T09:39:09.0683464Z             	            	Diff:
2023-12-27T09:39:09.0684787Z             	            	--- Expected
2023-12-27T09:39:09.0686112Z             	            	+++ Actual
2023-12-27T09:39:09.0687268Z             	            	@@ -102,3 +102,3 @@
2023-12-27T09:39:09.0688699Z             	            	   EnableJointConsensus: (bool) true,
2023-12-27T09:39:09.0690280Z             	            	-  EnableTiKVSplitRegion: (bool) false,
2023-12-27T09:39:09.0691686Z             	            	+  EnableTiKVSplitRegion: (bool) true,
2023-12-27T09:39:09.0693686Z             	            	   Schedulers: (config.SchedulerConfigs) (len=6) {
2023-12-27T09:39:09.0695266Z             	Test:       	TestConfigTestSuite/TestConfigAll

CI link

https://github.com/tikv/pd/actions/runs/7337061927/job/19977345043?pr=7622

Reason for failure (if possible)

Anything else

[CabinfeverB]

https://github.com/tikv/pd/actions/runs/7484146997/job/20370538377?pr=7683