Change embedded posts to use web UI (#31766)

Co-authored-by: Claire <claire.github-309c@sitedethib.com>

app/javascript/entrypoints/public.tsx

@@ -37,43 +37,6 @@ const messages = defineMessages({
   },
 });
 
-interface SetHeightMessage {
-  type: 'setHeight';
-  id: string;
-  height: number;
-}
-
-function isSetHeightMessage(data: unknown): data is SetHeightMessage {
-  if (
-    data &&
-    typeof data === 'object' &&
-    'type' in data &&
-    data.type === 'setHeight'
-  )
-    return true;
-  else return false;
-}
-
-window.addEventListener('message', (e) => {
-  // eslint-disable-next-line @typescript-eslint/no-unnecessary-condition -- typings are not correct, it can be null in very rare cases
-  if (!e.data || !isSetHeightMessage(e.data) || !window.parent) return;
-
-  const data = e.data;
-
-  ready(() => {
-    window.parent.postMessage(
-      {
-        type: 'setHeight',
-        id: data.id,
-        height: document.getElementsByTagName('html')[0]?.scrollHeight,
-      },
-      '*',
-    );
-  }).catch((e: unknown) => {
-    console.error('Error in setHeightMessage postMessage', e);
-  });
-});
-
 function loaded() {
   const { messages: localeData } = getLocale();