Blocked 'frame-src' from 'insight.adsrvr.org' (The Trade Desk script)

Description

There is a large number of Blocked 'frame-src' from 'insight.adsrvr.org' errors in production and canary:

https://new-sentry.gitlab.net/organizations/gitlab/issues/238010/

These errors are due to the Trade Desk script that are included in a few different URLs, however they are related to the registration process:

Possible consequences

Our conversion tracking probably has incomplete data.

Possible fixes

We should fix the CSP configuration to match the Trade Desk script additions.