flaky test TestClearCache

[hawkingrei]

Bug Report

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1. Minimal reproduce step (Required)

2. What did you expect to see? (Required)

3. What did you see instead (Required)

     advancer_test.go:291: 
        	Error Trace:	br/pkg/streamhelper/advancer_test.go:291
        	Error:      	Should be true
        	Test:       	TestClearCache
        	Messages:   	failed to mark the cluster: 
--- FAIL: TestClearCache (0.00s) 

https://tiprow.hawkingrei.com/view/gs/pingcapprow/pr-logs/pull/pingcap_tidb/50695/tiprow_fast_test/1750712244250873856#1:build-log.txt%3A1496

4. What is your TiDB version? (Required)

[D3Hunter]

met again

=== RUN   TestClearCache
[2024/02/19 06:38:40.410 +00:00] [INFO] [advancer.go:306] ["meet task event"] [event=Add(whole)]
[2024/02/19 06:38:40.411 +00:00] [INFO] [db.go:208] ["inc log backup task"] [count=1]
[2024/02/19 06:38:40.411 +00:00] [INFO] [advancer.go:400] ["added event"] [task="name:\"whole\" "] [ranges="{[, inf)}"] [current-checkpoint=0]
[2024/02/19 06:38:40.412 +00:00] [INFO] [advancer.go:286] ["current last region"] [category="log backup advancer hint"] [min="([, inf), 0)"] [for-polling=1] [min-ts=1970-01-01T00:00:00Z]
[2024/02/19 06:38:40.413 +00:00] [INFO] [advancer.go:531] ["updated log backup GC safe point."] [checkpoint=18446744073709551615] [target=18446744073709551615]
    advancer_test.go:291: 
        	Error Trace:	br/pkg/streamhelper/advancer_test.go:291
        	Error:      	Should be true
        	Test:       	TestClearCache
        	Messages:   	failed to mark the cluster: 
--- FAIL: TestClearCache (0.00s)

[wuhuizuo]

met in release-7.5:

• https://do.pingcap.net/jenkins/blue/organizations/jenkins/pingcap%2Ftidb%2Frelease-7.5%2Fghpr_unit_test/detail/ghpr_unit_test/559/pipeline
• https://do.pingcap.net/jenkins/blue/organizations/jenkins/pingcap%2Ftidb%2Frelease-7.5%2Fghpr_unit_test/detail/ghpr_unit_test/559/pipeline

[wuhuizuo]

/label affects-7.5