FR (Authenticator): Support global sign-out about amplify-ui HOT 4 OPEN

Need me to pick this one up? ;)

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@ericclemmons
I tried to use Auth.signOut({ global: true }) for a linked google account logout but I got this error from https://cognito-idp.us-east-1.amazonaws.com/ request.

Access Token does not have required scopes

Could you tell me how to set up the scope for this?

This is what I have in my Cognito app client settings

It is not mentioned in the these documents
https://docs.amplify.aws/lib/auth/emailpassword/q/platform/js#re-send-confirmation-code
https://docs.aws.amazon.com/cognito/latest/developerguide/cognito-user-pools-app-idp-settings.html

from amplify-ui.

Since we provide a signOut() method in @next, this method should support passing options:

<button onClick={() => signOut({ global: true })>Sign Out</button>

which gets passed to:

services: {
  signOut(context, event) {
	Auth.signOut(event.data);
  }
}

from amplify-ui.

Turns out this is harder to do than anticipated because the signOut actor only receives an xstate.init event, not the actual data from sendToMachine('SIGN_OUT').

De-scoping from the GA release so that we can investigate the following:

1. Remove signOut actor in favor of simpler invoke flow.
2. Ensure signOut route still exists and is returned for headless usage.

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