refs https://github.com/TryGhost/Team/issues/1004
The `tiers` column for a post/page only contained data if its visibility is set to `tiers`, otherwise its empty. This is because originally the purpose of `tiers` column on `post` was to capture specific tiers with access to post.
The best way to ensure a consistent behavior for `tiers` column data on post is to update it to always contain list of all `tiers` that have access to post, and not just when the visibility is `tiers`. This means the value is set to all tiers when visibility is one of public|members, and only paid tiers when visibility is `paid`. This change also allows on frontend to get all relevant `tiers` information for a post locally within post context instead of relying on additional information from outside.
This change -
- updates the output serializer for post/page to add all desired tiers manually in case of visibility is not `tiers`
- updates tests
refs https://github.com/TryGhost/Toolbox/issues/135
- Going though local utils allows to have the "withFrontend: false" flag applied only to the e2e-api test suites. This way we can gradually introduce the no-frontend change across all test suites
