getChatMessage retrieves a chat message by its chat and message IDs.
Example
automations/get-teams-chat-message.automation.ts
Inputs
chatId and messageId are required opaque strings. Optional account selects
the Microsoft binding. Inputs accept compatible signals.
Output
Returns the complete normalizedTeamsChatMessage, including messageId, body,
importance, sender, timestamps, attachments, mentions, reactions, and optional
provider metadata.