Add redirect to /log-in page when user is already logged in for WCCOM…

… login flow (#95353)

* Add redirect to /log-in page when user is already logged in

* Ensure return empty component

client/signup/steps/user/index.jsx

@@ -1,4 +1,5 @@
 import config from '@automattic/calypso-config';
+import page from '@automattic/calypso-router';
 import { localizeUrl } from '@automattic/i18n-utils';
 import { isHostingSignupFlow, isNewsletterFlow } from '@automattic/onboarding';
 import { WPCC } from '@automattic/urls';
@@ -747,6 +748,11 @@ export class UserStep extends Component {
 			return this.renderGravatarSignupStep();
 		}
 
+		if ( isWooOAuth2Client( this.props.oauth2Client ) && this.props.userLoggedIn ) {
+			page( this.getLoginUrl() );
+			return null;
+		}
+
 		// TODO: decouple hideBack flag from the flow name.
 		return (
 			<StepWrapper