ensure log alerts use threshold window for lookback

[Vadman97]

Summary

Log alerts would use the frequency as the lookback, but the frequency is meant to dictate how often the alert triggers.
Use the threshold_window to query a configurable time range for the alert.

How did you test this change?

Local deploy

Are there any deployment considerations?

no

Does this work require review from our design team?

no

[linear]

WHO-30 Issue with the `frequency` setting causing incorrect count over a 15-minute range, fixing it

[changeset-bot]

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Latest commit: d897e68

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