Since the PR "Do not use third-party cookies in embedded videos #5548", the logic from
"embed_videos_helper" was extracted to the "embedded_video_component" and the
"videoable" model concern.
However, during this refactor, the "regex" method, which uses record.class:: to handle
video embeds, was left inaccessible for Legislation Proposals.
This commit fixes the issue by including the concern in the Legislation Proposal model.
93189d3ecd