TestBootstrapDefaultKeyspaceGroup is unstable

[lhy1024]

Flaky Test

Which jobs are failing

--- FAIL: TestCommonTestSuite (18.04s)
    --- FAIL: TestCommonTestSuite/TestBootstrapDefaultKeyspaceGroup (2.23s)
        server_test.go:615: 
            	Error Trace:	/home/runner/work/pd/pd/tests/integrations/mcs/tso/server_test.go:615
            	            				/home/runner/work/pd/pd/tests/integrations/mcs/tso/server_test.go:627
            	Error:      	Should be empty, but was [{http://127.0.0.1:36161/ 0}]
            	Test:       	TestCommonTestSuite/TestBootstrapDefaultKeyspaceGroup
FAIL

CI link

https://github.com/tikv/pd/actions/runs/9936180084/job/27444347281

Reason for failure (if possible)

Anything else

[HuSharp]

meet again https://github.com/tikv/pd/actions/runs/10038617139/job/27740906406

2024-07-22T10:04:27.1642302Z     server_test.go:615: 
2024-07-22T10:04:27.1643497Z         	Error Trace:	/home/runner/work/pd/pd/tests/integrations/mcs/tso/server_test.go:615
2024-07-22T10:04:27.1645599Z         	            				/home/runner/work/pd/pd/tests/integrations/mcs/tso/server_test.go:627
2024-07-22T10:04:27.1646908Z         	Error:      	Should be empty, but was [{http://127.0.0.1:46031 0}]
2024-07-22T10:04:27.1648102Z         	Test:       	TestCommonTestSuite/TestBootstrapDefaultKeyspaceGroup

[okJiang]

https://github.com/tikv/pd/actions/runs/10315804333/job/28556718444?pr=8507