Gary Pendergast 1666ea22b7 Comments: Fix backward compatibility regressions in comment reply JavaScript.
Adds a `MutationObserver` to `comment-reply.js` to allow for lazy-loaded comments to continue working without the need to re-initialize the comment form.

Merges [44748] to the 5.1 branch.

Fixes #46260.

Built from https://develop.svn.wordpress.org/branches/5.1@44751


git-svn-id: http://core.svn.wordpress.org/branches/5.1@44583 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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