Draft: Move to <iframe> providers

Asherah Connorrequested to merge
kiv/move-to-iframe-providers into kiv/convert-iframe-allowlist-setting-to-provider-ids

What does this MR do and why?

MR stack

MR 4/9 of Rework <iframe> embed configuration (#599713):

  1. Add `<iframe>` provider model and parser (!254943 - merged)
  2. Add `<iframe>` provider loader and base config (!254944 - merged)
  3. Convert `<iframe>` allowlist setting to provide... (!254945)
  4. Draft: Move to `<iframe>` providers (!254946) ⬅️ you are here
  5. Draft: Remove dead `<iframe>` transform code (!254947)
  6. Draft: Frontend `<iframe>` hardening (!254948)
  7. Draft: Click-to-activate functionality for `<if... (!254949)
  8. Draft: Admin UI for `<iframe>` providers (!254950)
  9. Draft: Mark `<iframe>` provider loader and conf... (!255246)

Part of <iframe> embeds in Markdown content (#282443).

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Edited by Asherah Connor

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