Revert "a8n: Send campaigns count in usage pings (#8361)"
Created by: mrnugget
This reverts https://github.com/sourcegraph/sourcegraph/pull/8361. For full context see discussion at https://sourcegraph.slack.com/archives/CN4FC7XT4/p1581446020127100.
I'll follow this revert up with a PR that adds the full, proper version.