Add IDE CTA pings

Created by: vdavid

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