DEV: Remove lazy-yt and replace with lazy-videos (#20722)

- Refactors the old plugin to remove jquery usage
- Adds support for Vimeo videos (default on) and Tiktok (experimental and default off)

plugins/discourse-lazy-videos/plugin.rb

@@ -0,0 +1,28 @@
+# frozen_string_literal: true
+
+# name: discourse-lazy-videos
+# about: Lazy loading for embedded videos
+# version: 0.1
+# authors: Jan Cernik
+# url: https://github.com/discourse/discourse-lazy-videos
+
+hide_plugin if self.respond_to?(:hide_plugin)
+enabled_site_setting :lazy_videos_enabled
+
+register_asset "stylesheets/lazy-videos.scss"
+
+require_relative "lib/lazy-videos/lazy_youtube"
+require_relative "lib/lazy-videos/lazy_vimeo"
+require_relative "lib/lazy-videos/lazy_tiktok"
+
+after_initialize do
+  on(:reduce_cooked) do |fragment|
+    fragment
+      .css(".lazy-video-container")
+      .each do |video|
+        title = video["data-video-title"]
+        href = video.at_css("a")["href"]
+        video.replace("<p><a href=\"#{href}\">#{title}</a></p>")
+      end
+  end
+end