Add DefaultDeploymentTemplate to mfe.json

[daniel-rodrigues809]

Description

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[Copilot]

Pull Request Overview

This PR adds a new DefaultDeploymentTemplate property to the machine learning services API specification. The change introduces a template configuration that can be associated with model versions to specify default deployment settings.

• Adds DefaultDeploymentTemplate object with assetId property to model version schema
• Enables models to reference deployment templates for streamlined deployment workflows