[WIP] Move properties to MessageActivityInput from Activity

[Copilot]

• Move add_ai_generated, add_feedback, and add_citation methods from ActivityInput base class to MessageActivityInput class
• Move related helper methods (_ensure_single_root_level_message_entity, _update_entity) to MessageActivityInput
• Update existing tests in test_activity.py to use MessageActivityInput instead of a concrete test activity
• Run type checking and tests to verify changes
• Run code review and security checks

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[heyitsaamir]

@copilot try again

[Copilot]

@copilot try again

Fixed in e8d6495. The tests now properly use MessageActivityInput for the add_ai_generated, add_feedback, and add_citation methods. All 388 tests pass.

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