♻️(backend) simplify roles by returning only the max role

We were returning the list of roles a user has on a document (direct
and inherited). Now that we introduced priority on roles, we are able
to determine what is the max role and return only this one.

This commit also changes the role that is returned for the restricted
reach: we now return None because the role is not relevant in this
case.

CHANGELOG.md

@@ -25,6 +25,7 @@ and this project adheres to
 
 ### Changed
 
+- ♻️(backend) simplify roles by ranking them and return only the max role #846
 - 📌(yjs) stop pinning node to minor version on yjs docker image #1005
 - 🧑‍💻(docker) add .next to .dockerignore #1055
 - 🧑‍💻(docker) handle frontend development images with docker compose #1033
@@ -114,10 +115,6 @@ and this project adheres to
 - 🐛(backend) race condition create doc #633
 - 🐛(frontend) fix breaklines in custom blocks #908
 
-## Fixed
-
-- 🐛(backend) fix link definition select options linked to ancestors #846
-
 ## [3.1.0] - 2025-04-07
 
 ## Added