if we are in the Merge Requests page, this change will clone existing note-edit-form and add a mr-discussion-edit-form class to cloned element so we will have two note-edit-form in place. One for Discussions tab one for Changes tab.

For MR page, we basically need two note-edit-form because you may want to edit your comment in both tabs at the same time and we shouldn't remove or discard note-edit-form in other tab.

Also added relevant specs and refactored to_references in a bunch of places to be more consistent.

Updates CHANGELOG entry with MR ID

If a user presses the 'Register' button too quickly after attempting
to solve the reCAPTCHA, or the reCAPTCHA is not solved at all, the
user would experience a 500 error. Now, the case is properly
handled and the user will be sent back to the registration page
with a clear error message and can try again.

It's too easy to mistype an email or password when signing up.
The support team is receiving an increasing number of requests
because users mistype their email. We can eliminate this problem
by requiring users to confirm the email before registering. The
same issue can occur for the password field so we should add
this, too. We should note that password confirmation is part
of the default Devise forms. I don't know why/when GitLab
removed it.

Adds MR ID to changelog entry