Make sure all internal services send read requests to read only registry node

[t83714]

Make sure all internal services send read requests to read only the registry node

Magda gateway will auto-proxy external read requests to read-only the registry node.

However, internal service requests will not be benefited from this feature.

This ticket is about ensuring all internal services send read requests to read-only registry nodes when available.

Possbile Solutions

• Manually check all internal services to make sure they send requests to the correct service endpoint (registry-read-only)
• Implement an internal proxy (a new micro-service behind the service name registry) to auto-proxy all requests.