fix(unit test): sql run slower in unit tests.

[youngsofun]

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Summary

the origin test assume the sqls in this case should finish very soon.

create table involves fsync, so it may take more than 1 sec to finish.

not sure why select from system.query_log can not return in 1 sec, not reproduced manual test with standalone query server

Fixes https://github.com/datafuselabs/databend/issues/7831

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databend	✅ Ready (Inspect)	Visit Preview	Sep 23, 2022 at 1:05PM (UTC)