Describe the bug

In some short_description fields, I can add a Video embed (for instance, from YouTube) and it isn't shown in the frontend.

To Reproduce
Steps to reproduce the behavior:

1. Sign in as admin
2. Go to a process edit form in the admin dashboard
3. Add a video embed in the "short_description" field
4. Click on "Update"
5. Click on "View public page"
6. See that you don't have the video embed

Expected behavior

To not have the video embed option in the WYSIWYG editor.

Screenshots

Extra data (please complete the following information):

• Decidim Version: 0.27.1 / 0.28.0.dev
• Decidim installation: Metadecidim

Additional context

As an alternative we could show these video embed, but they were actually removed because they were breaking the design in other contexts (like cards in /processes)

This was introduced in #10007