alerts: Do not alert on long transactions in codeintel-db

Created by: chrismwendt

During normal Rockskip indexing, some transactions that update big hops can take tens of minutes to finish. It would be nice if we could selectively ignore Rockskip transactions while still alerting on other codeintel-db transactions. Any idea how to do that easily? This PR omits codeintel-db from the check to at least stop the spurious alerts.

From https://github.com/sourcegraph/customer/issues/976#issuecomment-1145369932

Test plan

Ran in Grafana