codeintel: use repositoryId field in event_logs.argument json instead of url column
Created by: Strum355
We dont backfill old data here, the json field selector will return NULL for rows that don't have that json key and then match nothing in the JOIN.
Related PR https://github.com/sourcegraph/code-intel-extensions/pull/621
This is part of the work for private code on dotcom, specifically https://github.com/sourcegraph/sourcegraph/issues/20628. The reliance on the argument column is still necessary, further discussion can be found on Slack