fixes https://github.com/TryGhost/Team/issues/1900
refs https://github.com/TryGhost/Team/issues/1901
- Defaults to the same value as the current email_track_opens setting for existing installations, otherwise defaults to true
- Had to use a custom migration because the `addSetting` helper doesn't support using an existing setting as current value
- Added a minimal UI to change the setting, but this still needs some design magic 🪄✨
- Link replacement is disabled if `email_track_clicks` is disabled. In the future we might consider to still do parial additions, such as source attribution and maybe redirects (to discuss).
refs https://github.com/TryGhost/Team/issues/1899
- Added `addEmailAttributionToUrl` method to MemberAttributionService. This adds both the source attribution (`rel=newsletter`) and member attribution (`?attribution_id=123&attribution_type=post`) to a URL.
- The URLHistory can now contain a new sort of items: `{type: 'post', id: 'post-id', time: 123}`.
- Updated frontend script to read `?attribution_id=123&attribution_type=post` from the URL and add it to the URLHistory + clear it from the URL.
- Wired up some external dependencies to LinkReplacementService and added some dummy code.
- Increased test coverage of attribution service
- Moved all logic that removes the subdirectory from a URL to the UrlTranslator instead of the AttributionBuilder
- The UrlTranslator now parses a URLHistoryItem to an object that can be used to build an Attribution instance
- Excluded sites with different domain from member id and attribution tracking
