Blocknote does not support the absence of link suggest for the current backend

Reproduction steps

1. use a backend (e.g., Github until CRISTAL-625 is done) that does not provide a  link suggestion service (or manually remove it from the loaded components)
2. edit a page with blocknote
3. insert an image (or insert a link)
4. observe the UI
5. try to insert a entity by manually entering its reference

Expected

• step 4: The user is informed of the absence of auto-suggest support (or at least is not hinted that suggestions are missing, which can be missleading).
• step 5: typing an entity reference and pressing enter inserts the entity

Actual

• step 5: typing an entity reference and pressing enter does nothing

Note

In Tiptap, the link suggest is explicitly mentioned in the UI. But not for image insertion.