Migrate integration tests from deprecated apollo-server v3 (EOL) to @apollo/server v5
- Replace gql imports from apollo-server with graphql-tag package
- Bump graphql peer dependency from ^16.3.0 to ^16.11.0
- Update test expectations: Apollo Server v5 no longer runs an introspection query on startup, so the server start transaction name changes from Test Server Start (query IntrospectionQuery) to
Test Server Start