chore: main to dev downmerge

[Ragini-Microsoft]

Purpose

This pull request introduces a new workflow for automated Azure Developer (AZD) template validation, updates the deployment workflow to focus on actual deployments, and enhances the infrastructure-as-code (Bicep and generated ARM template) to support improved AI model deployment configuration and compatibility with the latest tooling.

The most important changes are:

CI/CD Workflow Improvements:

• Added a new GitHub Actions workflow (.github/workflows/azd-template-validation.yml) to automatically validate AZD templates on a schedule and via manual trigger, ensuring template quality and correctness.
• Updated the existing deployment workflow (.github/workflows/azure-dev.yml) to focus on provisioning and deploying resources using azd, removing template validation steps and adding environment setup, Azure login, and deployment commands.

Infrastructure as Code Enhancements:

• Updated AI model deployment logic in infra/deploy_ai_foundry.bicep and the generated infra/main.json to explicitly set the model version for embedding models and to conditionally include the version property in deployment resources. This ensures correct versioning and compatibility during deployment. [1] [2] [3] [4]
• Added explicit dependency on the AI project resource for AI model deployment, ensuring correct deployment order in ARM templates. [1] [2]

Tooling and Template Updates:

• Regenerated infra/main.json with Bicep v0.42.1 for compatibility and improved template hashes, reflecting updates in the underlying Bicep files. (infra/main.jsonL7-R8 and multiple other Fbd478a7 references)
• Minor formatting updates in ARM template variables (e.g., Windows-style line endings in reactAppLayoutConfig). [1] [2]

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.