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/spec/components/pretty_text_spec.rb

@@ -0,0 +1,32 @@
+# frozen_string_literal: true
+
+require "rails_helper"
+require "pretty_text"
+
+RSpec.describe PrettyText do
+  let(:post) { Fabricate(:post) }
+
+  it "replaces lazy videos in emails" do
+    cooked_html = <<~HTML
+      <div class="youtube-onebox lazy-video-container" data-video-id="kPRA0W1kECg" data-video-title="15 Sorting Algorithms in 6 Minutes" data-provider-name="youtube">
+        <a href="https://www.youtube.com/watch?v=kPRA0W1kECg" target="_blank" rel="noopener">
+          <img class="youtube-thumbnail" src="thumbnail.jpeg" title="15 Sorting Algorithms in 6 Minutes" width="690" height="388">
+        </a>
+      </div>
+
+      <div class="vimeo-onebox lazy-video-container" data-video-id="786646692" data-video-title="Dear Rich" data-provider-name="vimeo">
+        <a href="https://vimeo.com/786646692" target="_blank" rel="noopener">
+          <img class="vimeo-thumbnail" src="thumbnail.jpeg" title="Dear Rich" width="640" height="360">
+        </a>
+      </div>
+
+    HTML
+
+    email_formated = <<~HTML
+      <p><a href="https://www.youtube.com/watch?v=kPRA0W1kECg">15 Sorting Algorithms in 6 Minutes</a></p>
+      <p><a href="https://vimeo.com/786646692">Dear Rich</a></p>
+      HTML
+
+    expect(PrettyText.format_for_email(cooked_html, post)).to match_html(email_formated)
+  end
+end