Refactor Python error exception text to a single resource file

[cleemullins]

Related to:
microsoft/Agents#294
microsoft/Agents#273
microsoft/Agents#339

Refactor the error / exception text that's currently throughout the codebase into a single resource file. The C# pattern for this is here:
https://github.com/microsoft/Agents-for-net/edit/main/src/libraries/Client/Microsoft.Agents.Connector/Errors/ErrorHelper.cs#L36C66

This error text should include 3 things:

1. The formatting string used for the error. (extracted from the current code)
2. An Error code (can align with C#) that get added to the error text.
3. A URL that also gets added to the error text. The URL should follow the pattern:
   https://aka.ms/M365AgentsErrorCodes/#agentic-identity-with-the-m365-agents-sdk

This should result in an exception that looks like:

• Original code: raise ValueError(f"Failed to acquire token. {str(auth_result_payload)}")
• Revised Code: raise ValueError(f"{error_resources.FailedToAcquireToken})

The actual logged string would look like:

Failed to acquire token. 
... [payload goes here, just as it does today] ...

Error Code: -60012
Help URL: https://aka.ms/M365AgentsErrorCodes/#agentic-identity-with-the-m365-agents-sdk

Once the code is refactored, I'll update the URLs for the Agentic Errors to have the correct deep-link hashtags.

This refactor seems a good candidate for being done via a one of the LLMs.