test: cover isCompositeType identity across package entrypoints

[dosacha]

Summary

Adds integration coverage for isCompositeType identity across GraphQL.js package entrypoints and module conditions.

This is related to #4830, where upstream code using:

Object.values(schema.getTypeMap()).filter(isCompositeType)

can observe no composite types if GraphQL type instances and predicates come from different evaluated graphql module instances.

What changed

• Extended the conditional exports integration check to verify that:
  • graphql and graphql/type share the same GraphQLObjectType
  • graphql and graphql/type share the same GraphQLString
  • graphql and graphql/type share the same isCompositeType
  • ESM and CJS imports share the same isCompositeType
  • object types constructed through root, subpath, ESM, and CJS entrypoints are accepted by all isCompositeType predicates
• Added require('graphql/type') path checks alongside the existing require('graphql') path check.

Why

GraphQL.js v17 type predicates rely on internal __kind brand symbols. If supported package entrypoints or module conditions accidentally evaluate separate GraphQL.js module instances, a type created by one entrypoint can fail a predicate imported from another entrypoint.

This test does not change duplicate-module semantics. It only ensures that the supported package entrypoints and CJS/ESM conditions preserve predicate identity for the same built package.

Tests

Ran:

npm run node:test -- "src/type/__tests__/predicate-test.ts"
npm run node:test -- "src/jsutils/__tests__/instanceOf-test.ts"
npm run build:npm
npx prettier --check integrationTests/conditions/check.mjs integrationTests/conditions/cjs-importer.cjs
npx eslint --max-warnings 0 integrationTests/conditions/check.mjs integrationTests/conditions/cjs-importer.cjs
node --check integrationTests/conditions/check.mjs
node --check integrationTests/conditions/cjs-importer.cjs

Also ran a smoke check against the built npm package:

Module identity, subpath identity, and path checks passed.

Not run:

npm run check:integrations

because it requires the full Docker-based integration test environment.

Refs #4830

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