feat(nova-react-test-utils): add support for mocking data in relay resolvers

[sjwilczynski]

Summary

Enhanced the Nova Relay decorator to support providing mock data to Relay resolvers through the existing resolvers parameter. This enables per-story customization of Relay resolver behavior in Storybook, allowing the same resolvers configuration to mock both server GraphQL operations and Relay resolver data.

Key Changes

Core Implementation:

• Modified getNovaRelayDecorator to pass story-level resolvers to Relay environment creation
• Enhanced createNovaRelayEnvironment with getResolverContextForEnvironment() function that creates resolver context with resolve, storeById, and resolveById methods
• Added EnvironmentMockResolversContext<TypeMap> type for type-safe resolver context access (and TypeMap can still be used to make it resolve data types correctly)

Examples & Documentation:

• Created simple example: feedback-resolvers.ts with displayLabel field resolver
• Created complex example: suggested-friends-resolvers.ts demonstrating resolveById pattern with nested objects and @weak types
• Updated README with new FAQ section explaining Relay resolver mocking capability

As resolverContext exist only in newer relay versions, as an additional change we bump it to latest in the repo

[Markionium]

I wonder if we can somehow make this nicer. If you forget to do this it won't work, but perhaps if we generate these resolvers it might not be too bad.

[sjwilczynski]

I added more docs to explain this pattern and I am open to suggestions on how to improve it. But at least as first iteration it looks good to me and happy to follow up if we detect nicer patterns while using it in 1JS