refactor: Changed Async and Sync Azure credential retrieval

[Vamshi-Microsoft]

Purpose

This pull request refactors the codebase to consistently use the asynchronous version of the get_azure_credential function (get_azure_credential_async) across multiple modules. This change ensures compatibility with asynchronous workflows and improves consistency in how Azure credentials are retrieved.

Updates to Azure credential handling:

• Replaced get_azure_credential with get_azure_credential_async in the AIProjectClient initialization within async def init_ai_foundry_client() in src/app.py.
• Reverted to get_azure_credential from get_azure_credential_async in async def fetch_azure_search_content() in src/app.py, likely due to specific synchronous requirements in that context.

Updates to agent factories:

• Updated imports in src/backend/api/agent/browse_agent_factory.py, src/backend/api/agent/section_agent_factory.py, and src/backend/api/agent/template_agent_factory.py to use get_azure_credential_async. [1] [2] [3]
• Modified the async def create_or_get_agent(cls) method in all three agent factory modules to use await get_azure_credential_async() for initializing AIProjectClient. [1] [2] [3]

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.

What to Check

Verify that the following are valid

• 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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