Support for Microsoft Teams Mentions

[HeedfulCrayon]

Microsoft Teams has released support for allowing mentions via webhook. This would be beneficial to implement so that you could get notifications about your own build.
Information about mentions via webhooks can be found here https://learn.microsoft.com/en-us/microsoftteams/platform/task-modules-and-cards/cards/cards-format?tabs=adaptive-md%2Cdesktop%2Cconnector-html#user-mention-in-incoming-webhook-with-adaptive-cards

[devlead]

This is probably a good addition to the Microsoft Teams cake addin

https://github.com/cake-contrib/Cake.MicrosoftTeams