Update product analytics to use unprefixed Cube schemas

Problem to solve

As Phase 2 of the schema renaming process, with https://gitlab.com/gitlab-org/analytics-section/product-analytics/analytics-stack/-/issues/60 fully deployed to all environments, we now need to update the built-in visualization schemas and GraphQL state resolver to use the unprefixed Cube schemas.

Implementation plan - backend/frontend - 2️⃣

1. Update the built-in visualization schemas in the GitLab repo to use the new unprefixed Cube schemas.
2. Update the state_resolver.rb and specs.
3. Deploy the new built-in visualization schemas and state resolver to all environments for GitLab.com