Users/axsuarez/teams sample revision

[axelsrz]

This pull request introduces significant updates to authentication and configuration handling across multiple files in the Teams Agent sample application. The changes improve token acquisition error handling, streamline environment variable usage, and enhance the structure of authentication and authorization components.

Authentication Enhancements:

• libraries/microsoft-agents-authentication-msal/microsoft/agents/authentication/msal/msal_auth.py: Improved error handling in acquire_token_on_behalf_of by logging and raising exceptions when token acquisition fails.
• test_samples/app_style/authorization_agent.py: Replaced the get_token method with exchange_token to enable token exchange with specific scopes and an authentication handler ID.

Configuration Updates:

• test_samples/teams_agent/config.py: Updated the DefaultConfig class to use AgentAuthConfiguration instead of MsalAuthConfiguration and revised environment variable keys for better alignment with the SDK structure.
• test_samples/teams_agent/env.TEMPLATE: Refactored environment variable names to match the updated configuration structure and added placeholders for tenant ID, client ID, client secret, and connection name.

Codebase Simplification:

• test_samples/teams_agent/app.py: Refactored imports, removed redundant DefaultConnection and RestChannelServiceClientFactory, and introduced MsalConnectionManager and Authorization for cleaner authentication handling. Updated create_agent to pass STORAGE explicitly to TeamsSso. [1] [2]
• test_samples/teams_agent/teams_sso.py: Modified the TeamsSso class to accept Storage as a parameter and updated OAuthFlow initialization to use Storage instead of UserState. [1] [2]