codeintel: Break out WAU counts in pings
Created by: efritz
We send back the number of weekly active users that have had any code intel event (precise or search-based). This sends additional counts for weekly active users getting precise events, search-based events, precise xrepo events, and search-based xrepo events.
Fixes https://github.com/sourcegraph/sourcegraph/issues/17923. Sister commit that updates the BigQuery schema in https://github.com/sourcegraph/analytics/pull/96.