flaky test: test_private_tasks

[dantengsky]

Summary

https://github.com/databendlabs/databend/actions/runs/17587488859/job/49970092417?pr=18703
https://github.com/databendlabs/databend/actions/runs/17588325453/job/49964535731?pr=18704
https://github.com/databendlabs/databend/actions/runs/17575029630/job/49965744004
https://github.com/databendlabs/databend/actions/runs/17577242224/job/49931186568#step:5:955

Create WareHouse 1 Query ID: 01992f88b2f27261a127fa5221a64fb2
Create WareHouse 2 Query ID: 01992f88b31b7af3af41c280250ac38f
Create Table Query ID: 01992f88b3417892b8d95764d99a053a
Create Task 1 Query ID: 01992f88b36c72028b5f5c09ce9cea1c
Create Task 2 ID: 01992f88b3927f02a0d247b8c50e5d84
RESUME Task 1 ID: 01992f88dac971d1b581357a5a08d8e7
RESUME Task 2 ID: 01992f88daf07a61b05f5235fda1e3ed
❌ Mismatch
Expected: [["1"],["2"]]
Actual  : []

[KKould]

fixed: #18710