chore(path): remove isValid deprecation flag

be-graphes-model/src/main/java/org/insa/graphs/model/Path.java

@@ -241,8 +241,6 @@ public class Path {
      * </ul>
      * 
      * @return true if the path is valid, false otherwise.
-     * 
-     * @deprecated Need to be implemented.
      */
     public boolean isValid() {