Fix nested replies on Arender annotations

Not to be confused with NXP-25971

Replies to replies to annotations do not appear in Web UI, only in JSF. This is because replies to comments in JSF can be nested to seemingly infinite depth, whereas replies to annotations only have a depth of 1 level.

Steps to reproduce:

• Given a Picture document, navigate to the annotations tab in Web UI.
• Add an annotation.
• In a separate incognito window, load the same Picture document in JSF UI and click on the comments tab.
  => The annotation added in Web UI appears as a comment.
• Still on the comments tab in JSF UI, reply to the comment.
• In the Web UI annotations window, refresh the page.
  => The reply posted in JSF UI appears as a reply to the annotation in Web UI.
• Go back to the JSF comments window.
• Add a reply to the reply, created a third level of nested comments.
• In the Web UI annotations window, refresh the page.
  => The last reply does not show.