Support to /login into m365 copilot: Integrate m365 Graph Context into Copilot CLI

### Describe the feature or problem you'd like to solve

Enable Microsoft 365 Work Data Grounding for Copilot CLI

### Proposed solution

_No response_

### Example prompts or workflows

_No response_

### Additional context

The Copilot CLI is currently isolated from the Microsoft 365 Copilot data graph. This feature introduces grounding capabilities, granting the CLI access to organizational work data to enrich context and processing logic.