fix: Replace DefaultAzureCredential with ManagedIdentityCredential for production-safe authentication

[Prasanjeet-Microsoft]

Purpose

This pull request introduces a significant refactor to replace the use of DefaultAzureCredential with a new utility function, get_azure_credential, to dynamically select credentials based on the application environment. Additionally, it includes a minor fix in an environment variable name and adds a new environment variable to .env.sample.

Credential Management Refactor:

• Replaced DefaultAzureCredential with get_azure_credential in multiple files, including database_factory.py, postgresdbservice.py, azure_blob_storage_client.py, azure_computer_vision_client.py, azure_form_recognizer_helper.py, azure_postgres_helper.py, azure_search_helper.py, env_helper.py, llm_helper.py, and several others. This change ensures that the appropriate credential is selected based on whether the environment is dev or prod. [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16] [17] [18] [19] [20] [21] [22] [23] [24] [25] [26] [27] [28]

Utility Function Addition:

• Added get_azure_credential and get_azure_credential_async functions in azure_credential_utils.py. These functions dynamically select between DefaultAzureCredential and ManagedIdentityCredential based on the APP_ENV environment variable.

Environment Configuration Updates:

• Added a new APP_ENV variable to .env.sample to specify the application environment (dev or prod). This variable is used to determine the credential type in the new utility functions.
• Corrected a typo in the environment variable SEMANTIC_KERNEL_SYSTEM_PROMPT in env_helper.py.

These changes improve the flexibility and security of credential management while also addressing a minor issue in the environment configuration.

Does this introduce a breaking change?

• Yes
• No

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