Removal of deprecated tactics and add ability to query is_external

As of 2024-04, we are making it easier to use our External Marketing API by removing old deprecated values and exposing is_external as a value.

Breaking Changes

• The deprecated follow_up, receipt, display, search, seo and direct marketing tactics are being removed from the 2024-04 API version. See the MarketingTactic documentation for which tactics should be used instead.

Non-breaking Changes

• The is_external attribute can be fetched in the MarketingActivities query to know if an activity was created and is managed by an external platform.