[Core] Bind gRPC servers to the node address family

[400Ping]

Description

This PR allows Ray's core gRPC servers to bind using the address family of the
node's advertised IP address.

Previously, ray start --node-ip-address=<IPv6 address> advertised an IPv6
node address, but GrpcServer selected its wildcard bind address from the
system's localhost resolution. On IPv4-first systems, this caused the server
to listen on 0.0.0.0 even when the Ray node advertised an IPv6 address.

As a result, an IPv6-only worker could attempt to connect to the GCS through
IPv6 while the GCS was only listening on an IPv4 socket.

The new bind behavior is:

Advertised node address	gRPC bind address
localhost	Resolved localhost address
127.0.0.1	127.0.0.1
::1	::1
Non-loopback IPv4	0.0.0.0
Non-loopback IPv6	::

Changes

• Select the gRPC wildcard bind address from the advertised node IP:
  • IPv4 → 0.0.0.0
  • IPv6 → ::
  • Loopback addresses remain local-only.
• Apply the address-family-aware binding to GCS, NodeManager, ObjectManager,
  CoreWorker, and the dashboard agent.
• Add IPv4/IPv6 mapping tests and an IPv6 gRPC connectivity test.
• Skip the IPv6 socket test safely when the test environment does not support
  IPv6.
• Log the complete gRPC bind address with the actual dynamically allocated
  port.

Related issues

Related to
#54660
ray-project/kuberay#5215

Additional information

[gemini-code-assist]

Code Review

This pull request updates Ray's gRPC server binding logic to accept a node_ip_address string instead of a boolean flag, allowing servers to dynamically bind to the correct wildcard address (0.0.0.0 or ::) matching the node's address family. This change is integrated across both C++ and Python/Cython layers. Feedback on these changes includes simplifying the IsIpv6LoopbackAvailable test helper to avoid a full TCP handshake, passing node_ip_address by const std::string & in the GrpcServer constructor to prevent unnecessary string copies, and removing the Optional[str] type hint in Cython to avoid a potential runtime NameError.

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[machichima]

cc @Yicheng-Lu-llll