Remove alert for update_scripts.
Remove alert for update_scripts.

This query is taking several minutes to complete and causing "Failed to execute query" alerts.

borenet: "Here's my vote on the update-scripts alert: Let's kill it.  It's rarely actionable since it's typically due to a flake, and sometime soon(tm) update_scripts errors will actually fail the build: https://bugs.chromium.org/p/chromium/issues/detail?id=421769"

BUG=skia:

Review URL: https://codereview.chromium.org/1916843002

google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot