Model integration with DT and online-deployment message

[kshitij-microsoft]

Description

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• The pull request does not introduce [breaking changes]
• CHANGELOG is updated for new features, bug fixes or other significant changes.
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Testing Guidelines

• Pull request includes test coverage for the included changes.

[Copilot]

Pull request overview

This PR integrates default deployment template support for models in Azure ML SDK and adds informational messaging when deploying models with configured deployment templates. The changes include:

1. Adding defaultDeploymentTemplate field to Model entities with proper serialization
2. Creating new DefaultDeploymentTemplate class for managing deployment template references
3. Updating deployment operations to check for and inform users about default deployment templates
4. Modifying REST client code generation for proper field naming (camelCase in JSON)
5. Updating swagger configuration and auto-generated REST client operations

Key Changes

• New DefaultDeploymentTemplate entity class with schema support
• Model entity extended with default_deployment_template field
• Deployment operations enhanced to display informational messages about default deployment templates
• Sample file demonstrating usage patterns
• Swagger configuration updated with new API version (v2025-04-01-preview)
• REST client operations auto-regenerated with style improvements

Reviewed changes

Copilot reviewed 45 out of 47 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
swagger/.../readme.md	Updated swagger configuration, fixed tag conditions, added v2025-04-01-preview
swagger/.../mfe.json	Changed field name from DefaultDeploymentTemplate to defaultDeploymentTemplate (camelCase)
samples/model_with_deployment_template_example.py	Example code demonstrating DefaultDeploymentTemplate usage (contains hardcoded credentials)
operations/_online_deployment_operations.py	Added credential parameter to upload_dependencies call
operations/_model_operations.py	Updated return type and imports for v2021_10_01_dataplanepreview models
operations/_deployment_template_operations.py	Temporarily changed endpoint to test environment
operations/_batch_deployment_operations.py	Added credential parameter to upload_dependencies call
entities/.../default_deployment_template.py	New entity class for deployment template references
entities/.../model.py	Added default_deployment_template field with serialization support
entities/init.py	Exported DefaultDeploymentTemplate class
_utils/_endpoint_utils.py	Added logic to check and log messages about default deployment templates
_schema/assets/model.py	Added schema field for default_deployment_template
_schema/assets/default_deployment_template.py	New schema for DefaultDeploymentTemplate
_restclient/v2021_10_01_dataplanepreview/operations/*.py	Auto-generated REST client operations with style improvements

[github-actions]

API Change Check

APIView identified API level changes in this PR and created the following API reviews

azure-ai-ml

[jayesh-tanna]

Please update changelog

[jayesh-tanna]

Please update samples as per code change. this sample code will be published in the ms public documentation: https://github.com/Azure/azure-sdk-for-python/tree/main/sdk/ml/azure-ai-ml/samples

[jayesh-tanna]

consider to add/update test cases wherever possible