While the new property is essential for matching SERPs, it is required so that the change
can be uplifted this change to other builds and avoid test_search_telemetry_config_validation.js
breaking when search-telemetry-v2.json is updated.
It is probably safer to update the schema on various builds, and only land the code changes
that depend on the update to search-telemetry-v2 on Nightly so that if we encounter an error
in search telemetry, its impact is minimal.
We can always update the schema to include the new property in required when all clients
have an updated search-telemetry-v2 dump.
Differential Revision: https://phabricator.services.mozilla.com/D197746
ce8decc058