[Sprint/KiltedKoala](feat): Added in comment-tree e2e tests #1635

Closes #1635 (closed)

Took longer than initially anticipated, decided to make sure the voting works while I was in here.

Note indexes for the functions at ln:29 all equal 2 because that is the position we need for the top element on the comment tree, but the framework is there to grab 2nd, 3rd commments in a clean way.

GitLabs pipeline formatting is screwed up at the moment, and everything outputs on a new line. To make output readable, run

var style = document.createElement('style');
style.innerHTML = '.build-page .section-header ~ .section.line {margin-left: 0px !important; display: inline !important;}';

var ref = document.querySelector('script');
ref.parentNode.insertBefore(style, ref);

In browser console on the page.