persistedsqlstats: speed up a test

[yuzefovich]

trafficstars

Previously, a single unit test could take on the order of 4 minutes (or even exceed 5 minute timeout, rarely) because the job monitor checks whether a cluster setting has been updated only every minute, and we update the cluster setting twice in a unit test. This commit makes it so that in a testing setup the check happens every second.

Release note: None

[cockroach-teamcity]

This change is 

[yuzefovich]

TFTR!

bors r+

[craig[bot]]

Build succeeded:

• Bazel Essential CI (Cockroach)

[blathers-crl[bot]]

Encountered an error creating backports. Some common things that can go wrong:

1. The backport branch might have already existed.
2. There was a merge conflict.
3. The backport branch contained merge commits.

You might need to create your backport manually using the backport tool.

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error creating merge commit from 1cc47c2dc5e4883bac80f0638359a178c91b95b8 to blathers/backport-release-22.1-88496: POST https://api.github.com/repos/cockroachdb/cockroach/merges: 409 Merge conflict []

you may need to manually resolve merge conflicts with the backport tool.

Backport to branch 22.1.x failed. See errors above.

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_{:owl: Hoot! I am a Blathers, a bot for CockroachDB. My owner is otan.}

[yuzefovich]

No need to backport this to 22.1 since the relevant changes from #86404 were not backported there.