Skip testStdDev in SingleStore tests

[elharo]

Description

Ignore this test in singlestore until the root cause is fixed.

Motivation and Context

Deflake

Impact

fixes #22564

Test Plan

CI

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Release Notes

== NO RELEASE NOTE ==

[tdcmeehan]

Do you have any idea why this specific test is effected? And have you seen this problem in more than one PR?

[elharo]

I've seen it more than once. Seems to be a bug in singlestore, not in presto