refs https://github.com/TryGhost/Team/issues/768
- `portal_products` stores list of products available in Portal
- adds new `portal_products` setting to default settings
- adds migration to populate `portal_products` with current product so its available by default
- update tests
refs https://github.com/TryGhost/Team/issues/770
We want post feature image functionality to better match what's available inside the editor, to do that we'll need somewhere to store alt and caption meta data. `posts_meta` chosen because even though we want to make this generic for other tables in the future those tables also have a `feature_image` (or closely related) field.
- updated schema with new columns
- added migration to create columns
- cleaned new columns from API output
- not output on v2/v3
- conditionally output on v4/canary output based on labs flag
- bumped `@tryghost/admin-api-schema` to allow new columns through in canary API requests
- silently clean properties from input when labs flag is disabled
- updated acceptance tests so they fail if `admin-api-schema` is not letting the new fields through
