Fail TSAN test: ComputeServerRunner.testCancelMPPGather

[wshwsh12]

Bug Report

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1. Minimal reproduce step (Required)

[2026-01-01T18:21:19.016Z] [2026/01/01 18:21:18.143 +00:00] [ERROR] [Exception.cpp:93] ["std::exception. Code: 1001, type: testing::AssertionException, e.what() = /home/jenkins/agent/workspace/tiflash-sanitizer-daily/tiflash/dbms/src/Flash/tests/gtest_compute_server.cpp:1590: Failure\nValue of: TiFlashMetrics::instance() .tiflash_task_scheduler.get(tiflash_task_scheduler_metrics::type_active_queries_count, \"\") .Value() == 2\n  Actual: false\nExpected: true"] [source="virtual void DB::tests::ComputeServerRunner_testCancelMPPGather_Test::TestBody()"] [thread_id=1]
[2026-01-01T18:21:19.016Z] /home/jenkins/agent/workspace/tiflash-sanitizer-daily/tiflash/dbms/src/Flash/tests/gtest_compute_server.cpp:1663: Failure
[2026-01-01T18:21:19.016Z] Failed

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

3. What did you see instead (Required)

4. What is your TiFlash version? (Required)