Fix: Update token acquisition logic for agentic scenarios

[MattB-msft]

Added client_info = 2 for Non User auth scenarios ( entra seems to want this now )

Updated user level acquireTokenByForAgenticScenarios to pass agentAppInstanceID and AgentToken for FIC exchange.

This pull request updates the MsalTokenProvider class to improve how authentication tokens are acquired, particularly for agentic scenarios. The main changes focus on adjusting token request parameters and method signatures to ensure correct handling of authentication flows.

Authentication flow improvements:

• Added a conditional to include client_info = '2' in the token request payload for all grant types except 'user_fic', ensuring proper client information is provided for most authentication scenarios.

• Updated the call to acquireTokenByForAgenticScenarios to pass agentAppInstanceId as a parameter instead of instanceToken, aligning the method signature and invocation with agentic authentication requirements.

[MattB-msft]

Fix for #834 and issue reported by end user;