flaky test TestIntersectionWithDifferentConcurrency in `pkg/executor/test/indexmergereadtest` pkg

[lance6716]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

https://do.pingcap.net/jenkins/blue/organizations/jenkins/pingcap%2Ftidb%2Fghpr_unit_test/detail/ghpr_unit_test/29046/pipeline

1317:==================== Test output for //executor/test/indexmergereadtest:indexmergereadtest_test (shard 16 of 30):
1318:=== RUN   TestIntersectionWithDifferentConcurrency
3157:-- Test timed out at 2023-07-28 11:33:06 CST --
3158:================================================================================
3159:==================== Test output for //executor/test/indexmergereadtest:indexmergereadtest_test (shard 16 of 30):
3160:=== RUN   TestIntersectionWithDifferentConcurrency
5351:-- Test timed out at 2023-07-28 11:35:39 CST --
5352:================================================================================
5353:==================== Test output for //executor/test/indexmergereadtest:indexmergereadtest_test (shard 16 of 30):
5354:=== RUN   TestIntersectionWithDifferentConcurrency
6595:-- Test timed out at 2023-07-28 11:38:14 CST --
6596:================================================================================

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

3. What did you see instead (Required)

4. What is your TiDB version? (Required)

[wuhuizuo]

Flaky runs happened 20 times between "2023-11-10" AND "2023-11-22"

- [CI build](https://do.pingcap.net/jenkins/job/pingcap/job/tidb/job/ghpr_unit_test/37878/) - [CI build](https://do.pingcap.net/jenkins/job/pingcap/job/tidb/job/ghpr_unit_test/37817/) - [CI build](https://do.pingcap.net/jenkins/job/pingcap/job/tidb/job/ghpr_unit_test/37797/) - [CI build](https://do.pingcap.net/jenkins/job/pingcap/job/tidb/job/ghpr_unit_test/37790/) - [CI build](https://do.pingcap.net/jenkins/job/pingcap/job/tidb/job/ghpr_unit_test/37713/) - [CI build](https://do.pingcap.net/jenkins/job/pingcap/job/tidb/job/ghpr_unit_test/37669/) - [CI build](https://do.pingcap.net/jenkins/job/pingcap/job/tidb/job/ghpr_unit_test/37667/) - [CI build](https://do.pingcap.net/jenkins/job/pingcap/job/tidb/job/ghpr_unit_test/37656/) - [CI build](https://do.pingcap.net/jenkins/job/pingcap/job/tidb/job/ghpr_unit_test/37627/) - [CI build](https://do.pingcap.net/jenkins/job/pingcap/job/tidb/job/ghpr_unit_test/37626/) - [CI build](https://do.pingcap.net/jenkins/job/pingcap/job/tidb/job/ghpr_unit_test/37623/) - [CI build](https://do.pingcap.net/jenkins/job/pingcap/job/tidb/job/ghpr_unit_test/37476/) - [CI build](https://do.pingcap.net/jenkins/job/pingcap/job/tidb/job/ghpr_unit_test/37469/) - [CI build](https://do.pingcap.net/jenkins/job/pingcap/job/tidb/job/ghpr_unit_test/37418/) - [CI build](https://do.pingcap.net/jenkins/job/pingcap/job/tidb/job/ghpr_unit_test/37402/) - [CI build](https://do.pingcap.net/jenkins/job/pingcap/job/tidb/job/ghpr_unit_test/37386/) - [CI build](https://do.pingcap.net/jenkins/job/pingcap/job/tidb/job/ghpr_unit_test/37348/) - [CI build](https://do.pingcap.net/jenkins/job/pingcap/job/tidb/job/ghpr_unit_test/37347/) - [CI build](https://do.pingcap.net/jenkins/job/pingcap/job/tidb/job/ghpr_unit_test/37309/) - [CI build](https://do.pingcap.net/jenkins/job/pingcap/job/tidb/job/ghpr_unit_test/37270/)

[wuhuizuo]

/reopen

[ti-chi-bot[bot]]

@wuhuizuo: Reopened this issue.

In response to [this](https://github.com/pingcap/tidb/issues/45632#issuecomment-1821970157): >/reopen Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes/test-infra](https://github.com/kubernetes/test-infra/issues/new?title=Prow%20issue:) repository.

[wuhuizuo]

/component test