Remove additional network settings from slurm A3U,A4,A4X VM examples

[agrawalkhushi18]

This PR eliminates additional network configuration in the slurm A3U, A4 and A4X VM examples. This is a follow up item referencing PR#5652

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[gemini-code-assist]

Summary of Changes

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This pull request streamlines the network interface configuration for several machine learning VM examples. By shifting from explicitly defined network structures to using 'instance_additional_networks' references, the configuration becomes more concise and easier to manage while maintaining the required network connectivity.

Highlights

• Network Configuration Simplification: Replaced hardcoded network interface definitions with references to 'instance_additional_networks' for A3U, A4, and A4X VM examples.
• Reduced Redundancy: Removed verbose network interface boilerplate in favor of modular network definitions, improving maintainability across VM example configurations.

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[gemini-code-assist]

Code Review

This pull request simplifies the network interface configuration in several machine learning VM blueprints (a3ultra-vm.yaml, a4high-vm.yaml, and a4x-vm.yaml) by replacing verbose inline network definitions with references to instance_additional_networks from the respective network modules. There are no review comments, and I have no feedback to provide.

[SwarnaBharathiMantena]

LGTM