EmbedShortcodeProvider templates should hardcode attributes

[emteknetnz]

Deprecated code was added for CVE-2022-38724

https://github.com/silverstripe/silverstripe-framework/pull/10583/files#diff-d0d2867af6bff9ad7e4ced04d5491feea4b4efec408b6e96b37e4f5eb46914ecR37

On the original security issue (private) it was said the deprecate code was added for CMS 4 and in CMS 5 the EmbedShortcodeProvider_*.ss templates would hardcode the attributes

Currently this hasn't been done e.g. EmbedShortcoderProvider_video.ss is

  <% loop $Attributes %> {$Name}="{$Value}"<% end_loop %>

We should either:
a) Hardcode attributes in templates and remove deprecated config/code
b) Undeprecate the attribute whitelist

Acceptance Criteria

• Implement option A - Hardcode attributes in templates and remove deprecated config/code

PRs

• API Remove configurability of attributes #10732

[maxime-rainville]

Done.