Lower sync event table partition cleanup threshold to 30 days

What does this MR do and why?

NOTE: It would be great if this MR was included in %17.3, since self-managed users are waiting for this fix.

This MR lowers the build/pipeline ClickHouse sync event records validity from 1 year to 30 days to avoid runaway table growth for self-managed users who don't have ClickHouse configured.

Changelog: fixed

Closes #478197 (closed)

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