CKEditor css bleeding

Problem/Motivation

Current CKEditor stylsheet is bleeding because:

ckeditor5-stylesheets:
  - /libraries/dsfr/dist/core/core.css
  - /libraries/dsfr/dist/utility/icons/icons.css

It's needed for proper display of DSFR icons in CKEditor.

Steps to reproduce

Open a node with body and icons plugin.

Proposed resolution

Have this css created dynamically from a route, or create a manual css copy.

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