fix: update env model version

[NirajC-Microsoft]

This pull request updates the Azure OpenAI API version and model version across configuration and documentation files to align with the latest supported versions.

Updates to Azure OpenAI API and Model Versions:

• .github/workflows/deploy.yml: Updated the azureOpenaiAPIVersion to 2025-01-01-preview for compatibility with the latest API version.
• docs/CustomizingAzdParameters.md: Updated the AZURE_ENV_MODEL_VERSION to 2025-04-14 and the AZURE_ENV_OPENAI_API_VERSION to 2025-01-01-preview in the documentation to reflect the new API and model version. Removed outdated allowed values for these parameters.## Purpose

• ...

Does this introduce a breaking change?

• Yes
• No

Golden Path Validation

• I have tested the primary workflows (the "golden path") to ensure they function correctly without errors.

Deployment Validation

• I have validated the deployment process successfully and all services are running as expected with this change.

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• I have built and tested the code locally and in a deployed app
• For frontend changes, I have pulled the latest code from main, built the frontend, and committed all static files.
• This is a change for all users of this app. No code or asset is specific to my use case or my organization.

Other Information

[github-actions]

🎉 This PR is included in version 1.6.1 🎉

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