Fix: Leak of SessionManager by removing both removeSession method

src/main/java/ch/unibas/dmi/dbis/cs108/casono/server/network/sessions/SessionManager.java

@@ -85,38 +85,6 @@ public class SessionManager {
         disconnect(event.sessionId());
     }
 
-    /**
-     * Removes a session by its ID.
-     *
-     * @param id the ID of the session to remove
-     * @return the removed session, or null if not found
-     */
-    public Session removeSession(SessionId id) {
-        SessionHandle handle = sessions.remove(id);
-
-        if (handle == null) {
-            return null;
-        }
-
-        return handle.session();
-    }
-
-    /**
-     * Removes the specified session.
-     *
-     * @param session the session to remove
-     * @return the removed session, or null if not found
-     */
-    public Session removeSession(Session session) {
-        SessionHandle handle = sessions.remove(session.getId());
-
-        if (handle == null) {
-            return null;
-        }
-
-        return handle.session();
-    }
-
     /**
      * Retrieves a session by its ID.
      *