Ref: #532

This PR fixes the issue by conditionally separating the listeners:

• If NodePorts are different: It creates separate Listeners and BackendSets (e.g., TCP-80 and UDP-80) to route traffic accurately to their respective NodePorts.
• If NodePorts are the same (or omitted/0): It retains the existing behavior and creates a single TCP_AND_UDP Listener for backward compatibility and resource optimization.
• To ensure backward compatibility, the logic compares the NodePort of the ServicePorts. The existing ProtocolTypeMixed logic is bypassed only when the NodePorts explicitly differ.
• Minor optimizations with string processing

Related unit tests passed.