Exception thrown when calling GetConversationMembers

[LeeParrishMSFT]

Version

4.14.1

Describe the bug

GetConversationMembers in Adaptive.Runtime is throwing "GetConversationMembersAsync() only works with BotFrameworkAdapter" exception when executed.

To Reproduce

Steps to reproduce the behavior:

1. Use GetConverationMembers in Composer Bot
2. Run the bot
3. See runtime error reflected as ""GetConversationMembersAsync() only works with BotFrameworkAdapter"

Expected behavior

This should return the conversation members, not throw an exception.

Additional context

This occurs due to the change of the CoreBotAdapter to now derive from CloudAdapter and not BotFrameworkAdapter, which causes the check in GetConversationMembers (in Microsoft.Bot.Builder.Dialogs.Adaptive.Actions) that the Adapter is a BotFrameworkAdapter to fail and throw an exception. This code can't rely any more on the adapter being a BotFrameworkAdapter and instead should be using the helper functions in TeamsInfo to retrieve and return this information.

This was originally reported by a customer in Issue: Error when I use GetConversationMembers In MS Teams.