Improve SSO auth flow

Use replaceState instead of a redirect to strip the loginToken
Put user into the same post-auth flows of E2ESetup
Skip UIA prompt in this post-auth flow, happy path is a server grace period

src/components/structures/auth/E2eSetup.js

@@ -24,6 +24,7 @@ export default class E2eSetup extends React.Component {
     static propTypes = {
         onFinished: PropTypes.func.isRequired,
         accountPassword: PropTypes.string,
+        tokenLogin: PropTypes.bool,
     };
 
     render() {
@@ -33,6 +34,7 @@ export default class E2eSetup extends React.Component {
                     <CreateCrossSigningDialog
                         onFinished={this.props.onFinished}
                         accountPassword={this.props.accountPassword}
+                        tokenLogin={this.props.tokenLogin}
                     />
                 </CompleteSecurityBody>
             </AuthPage>