GraphQL: Pagination fixes to comply with the Relay spec

This require changes to data sources (archive, search, indexers etc) and need a design.

https://relay.dev/graphql/connections.htm Fix issue in pagination 'after' argument

• Add missing mandatory fields to pageinfo
• after argument fix It will return objects from 'after' cursor. This is not in sync with the spec

---

Migrated from T4367 (view on Phabricator)