test(codegen): add snapshot tests for query keys factory pattern

[pyramation]

Summary

Adds comprehensive snapshot tests for the new query keys factory pattern generators introduced in PR #609. The tests cover three code generators:

• Query keys factory (generateQueryKeysFile) - centralized query keys following the lukemorales pattern
• Mutation keys factory (generateMutationKeysFile) - mutation keys for tracking in-flight mutations
• Cache invalidation helpers (generateInvalidationFile) - type-safe invalidation with cascade support

The test suite includes 16 test cases covering single tables, multiple tables, parent-child relationships, deep hierarchical relationships (org → db → table → field), custom queries/mutations, and configuration options like generateScopedKeys and generateCascadeHelpers.

Review & Testing Checklist for Human

• Review snapshot output for correctness: The snapshots capture ~1,670 lines of generated TypeScript. Verify the generated code patterns are correct, especially the hierarchical cascade invalidation logic (e.g., invalidate.organization.withChildren should properly cascade to database, table, and field entities)
• Verify test fixtures are representative: Check that the table definitions and relationship configurations in the test file match realistic usage patterns
• Run tests locally: cd graphql/codegen && pnpm test -- --testPathPattern="query-keys-factory" should pass with 16/16 tests

Notes

This PR targets the fix/improve-codegen-rq-mode branch (PR #609) as requested. If that base PR changes significantly, the snapshots may need to be regenerated.

Requested by: @pyramation
Devin session: https://app.devin.ai/sessions/4d5df52ad251452da815b8cb06618596

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