Re-enable `openrpc` snapshot tests

[akaladarshi]

Summary

Re-enable the OpenRPC snapshot test to automatically validate API documentation and catch breaking changes in Forest's RPC API.

The OpenRPC test rpc::tests::openrpc is currently disabled. However, this test serves critical functions for API stability, documentation generation, and ecosystem integration.

As Forest's RPC API is relatively stable, we should re-enable this test with improved tooling and workflows to manage snapshot updates.

Completion Criteria

• Remove the #[ignore] attribute from the openrpc() test
• Ensure snapshot files are properly generated and committed

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