Overlay does not stay when returning a promise

In checkout.js, returning a non-resolving promise would keep the overlay around. This was useful for merchants that do a redirect so that the background was not functional while the browser was performing the redirect. I cannot get this to work in the new payments SDK.

onApprove: function(data, actions) {
                    actions.redirect('http://www.google.com');
                    
                    return new Promise(function (resolve, reject) {} );
                },

onApprove: function(data, actions) {
                    return actions.redirect('http://www.google.com');
                },

https://youtu.be/-ovTDmvu_D4

[gregjopa]

Bump

[github-actions[bot]]

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