feat: replacing DefaultAzureCredential with ManagedIdentityCredential, RAI check, API upgrades

[Ragini-Microsoft]

Purpose

This pull request introduces several updates to enhance functionality, improve internationalization, and refactor Azure credential handling. Key changes include adding environment-specific Azure credential management, introducing locale-based date formatting, and updating various components to support user browser language preferences.

Internationalization and Localization Enhancements:

• Added methods in AppConfig to get and set the user's local browser language, and updated the InputTask endpoint to handle user language preferences (src/backend/app_config.py, src/backend/app_kernel.py). [1] [2] [3]
• Implemented locale-based date formatting for agent messages using the format_dates_in_messages function (src/backend/app_kernel.py).
• Updated HrTools and ProductTools to include locale-specific date formatting instructions (src/backend/kernel_tools/hr_tools.py, src/backend/kernel_tools/product_tools.py). [1] [2]

Azure Credential Refactoring:

• Replaced DefaultAzureCredential with a new utility function get_azure_credential to handle environment-specific Azure credential selection (src/backend/helpers/azure_credential_utils.py).
• Updated all instances of Azure credential usage to leverage the new get_azure_credential utility across the codebase (src/backend/app_config.py, src/backend/context/cosmos_memory_kernel.py, src/backend/config_kernel.py). [1] [2] [3]

Backend API Enhancements:

• Added a new /api/user_browser_language endpoint to receive and store the user's browser language preference (src/backend/app_kernel.py).
• Improved error handling for rate limit exceptions in the input_task_endpoint by extracting and formatting error messages (src/backend/app_kernel.py). [1] [2]

Infrastructure Updates:

• Introduced the APP_ENV variable in infra/main.bicep and .env.sample for environment-specific configurations. [1] [2] [3]

Dependency Additions:

• Added babel to requirements.txt for date and internationalization support.

Does this introduce a breaking change?

• Yes
• No

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Other Information

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