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/assets/javascripts/lib/lazy-video-attributes.js

@@ -0,0 +1,13 @@
+export default function getVideoAttributes(cooked) {
+  if (!cooked.classList.contains("lazy-video-container")) {
+    return {};
+  }
+
+  const url = cooked.querySelector("a")?.getAttribute("href");
+  const thumbnail = cooked.querySelector("img")?.getAttribute("src");
+  const title = cooked.dataset.videoTitle;
+  const providerName = cooked.dataset.providerName;
+  const id = cooked.dataset.videoId;
+
+  return { url, thumbnail, title, providerName, id };
+}