Handle multiple logins into TryAppService from same UI

[fashaikh]

microsoft/vscode-azureappservice#1672

This happens when you try a different auth method after you already have one resource in the same browser session (different tab or same) . Likely because the browser sends the previously cached session information. There was some discussion around this earlier, cant find the issue. Created this one to track this for future.

Workaround: use a different browser in this case or close al inPrivate sessions and open a new one