refs https://github.com/TryGhost/Team/issues/1575
- Updates the admin-api-schema to reflect new data structure
- Updates members-api to allow Portal to use new data structure
- Data is only mapped at the serialised level to avoid changing the underlying implementation
- Ensure only one version of domain-events present in yarn.lock
- We have an existing pattern for using `visibility: public` instead of `visible: true|false`
- We no-op the existing migration and roll forward so that we don't have to manually revert db changes
refs https://github.com/TryGhost/Team/issues/1313
Rather than removing the /products API we're adding a /tiers API as
a first step towards renaming "products" to "tiers". The initial idea was
to alias the URL's but out API framework doesn't easily allow for this so
we've duplicated it instead.
