Align ClientCitationIconName with Teams "Add citations" docs

[Copilot]

The ClientCitationIconName enum should mirror the predefined values for citation.appearance.image.name documented in the Teams Add citations article. All 21 documented names were already present, but the ordering diverged from the docs, the source of truth wasn't referenced, and there was no test pinning the list.

Changes

• Reorder enum entries to match the docs verbatim (Source Code and Sketch now precede the Adobe group). String values are unchanged, so wire format is unaffected.
• Docstring updated to cite the Teams "Add citations" docs URL.
• New test test_client_citation_icon_name_matches_teams_docs pins the full set and order of allowed names, so future drift in the docs is caught.

class ClientCitationIconName(str, Enum):
    """Supported citation icon names for ``citation.appearance.image.name``.

    See "Add citations":
    https://learn.microsoft.com/en-us/microsoftteams/platform/bots/how-to/bot-messages-ai-generated-content#add-citations
    """
    MICROSOFT_WORD = "Microsoft Word"
    # ...
    MICROSOFT_WHITEBOARD = "Microsoft Whiteboard"
    SOURCE_CODE = "Source Code"
    SKETCH = "Sketch"
    ADOBE_ILLUSTRATOR = "Adobe Illustrator"
    # ...

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[Copilot]

Pull request overview

This PR aligns the ClientCitationIconName enum with the ordering and documented source-of-truth for Teams’ citation.appearance.image.name predefined values, and adds a regression test to prevent future drift.

Changes:

• Reordered ClientCitationIconName members to match the Teams “Add citations” documentation order (string values unchanged).
• Updated the enum docstring to cite the Teams documentation URL.
• Added a test that pins both the exact set and ordering of allowed icon name values.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
tests/activity/entity/test_serialization.py	Adds a test that asserts the full set and order of ClientCitationIconName values matches the Teams docs list.
libraries/microsoft-agents-activity/microsoft_agents/activity/entity/ai_entity.py	Reorders enum entries and updates docstring to explicitly reference the Teams “Add citations” documentation.

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