Refactor AuthenticatedState to store displayName and uid

The AuthenticatedState interface was updated to directly store the
`displayName` and `uid` properties. Previously, it stored the entire
`CasContent` object, which contained these properties along with others
that were not consistently used. This change simplifies the interface
and reduces redundancy.

routes/_middleware.ts

@@ -77,13 +77,14 @@ export const handler: MiddlewareHandler<State>[] = [
       context.state.isFromPolytech = isFromPolytech;
 
       if (isFromPolytech) {
-        context.state.session = session;
+        context.state.displayName = session.displayName;
+        context.state.uid = session.uid;
 
-        if (session.eduPersonPrimaryAffiliation.includes("faculty")) {
+        if (session.eduPersonPrimaryAffiliation == "faculty") {
           context.state.role = "professeur"
-        } else if (session.eduPersonPrimaryAffiliation.includes("employee")) {
+        } else if (session.eduPersonPrimaryAffiliation == "employee") {
           context.state.role = "administration"
-        } else if (session.eduPersonPrimaryAffiliation.includes("student")) {
+        } else if (session.eduPersonPrimaryAffiliation == "student") {
           context.state.role = "etudiant";
         } else {
           context.state.role = "autre";