TestLeaderAndVoter is flaky

[okJiang]

Flaky Test

Which jobs are failing

    --- FAIL: TestRuleTestSuite/TestLeaderAndVoter (20.62s)
        testutil.go:67: 
            	Error Trace:	/home/runner/work/pd/pd/pkg/utils/testutil/testutil.go:67
            	            				/home/runner/work/pd/pd/tests/server/api/rule_test.go:982
            	            				/home/runner/work/pd/pd/tests/testutil.go:363
            	            				/home/runner/work/pd/pd/tests/testutil.go:323
            	            				/home/runner/work/pd/pd/tests/server/api/rule_test.go:903
            	Error:      	Condition never satisfied
            	Test:       	TestRuleTestSuite/TestLeaderAndVoter

CI link

https://github.com/tikv/pd/actions/runs/9968939441/job/27545022545

Reason for failure (if possible)

Anything else