Need to update the AI Citations Image names to pick up current list of known image sources

[MattB-msft]

Update the class named "ClientCitationIconName" need to be updated based on the values in "citation.appearance.image.name" in the article linked below called "Add Citations"

ClientCitationIconName class can be found here:

Agents-for-python/libraries/microsoft-agents-activity/microsoft_agents/activity/entity/ai_entity.py

Line 13 in 7b95cb8

class ClientCitationIconName(str, Enum):

Article with current list can be found here: https://learn.microsoft.com/en-us/microsoftteams/platform/bots/how-to/bot-messages-ai-generated-content?tabs=desktop%2Cjs%2Cbotmessage#add-citations