Important: This PR builds upon #29966, merge that first, then rebase!
Added a few lines to the site admin "pings" page, plus rationalized BExt ping description as well
Added notes to pings.md, plus rationalized BExt ping description as well
Added IDE CTA data to CTAUsage in types.go
Added IDE CTA-related SQL to CTA query, plus rationalized existing query lines and renamed a few variables to accommodate for the larger amount of data
Updated and ran the related test—it works as intended.
Test plan
Run sg start
Check the latest ping on the site admin page to see if the new data is included there