Use a alternative method to HTTP_REFERER to find the layout entity

Problem/Motivation

When running on an environment using Referrer-Policy: no-referrer due to security, the paragraph blocks list defaults to the numbered paragraph items rather than admin titles specified.

ParagraphBlocksEntityManager.php:
$referer = $this->requestStack->getCurrentRequest()->server->get('HTTP_REFERER');

Proposed resolution

Find an alternative to using the HTTP_REFERER to work out the node that is being edited.