Add debug logging for alt-click not inserting permalink

Add debug logging for alt-click not inserting permalink. We want to see if the event actually shows the alt key as pushed.

Currently, we don't know if the problem is a bug in our code or a bug in Chrome/Windows

See https://gitlab.com/gitlab-org/gitter/webapp/issues/2132

Debug permalink.requested

Enable logging

window.localStorage.debug = 'app:chat-item-view*,app:router-chat*';

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cc @cbj4074