[Server] [Client] Return BadIdentityTokenInvalid if use of anonymous identity token is not allowed (#3012)

* make Server return BadIdentityTokenInvalid if use of anonymous identity token is not allowed

* Change Response Code on Client side also to be consistent

* change response code ro BadIdentityTokenRejected

Author: romanett

Libraries/Opc.Ua.Client/Session/Session.cs

@@ -5425,7 +5425,7 @@ private void OpenValidateIdentity(
                 if (identityPolicy == null)
                 {
                     throw ServiceResultException.Create(
-                        StatusCodes.BadUserAccessDenied,
+                        StatusCodes.BadIdentityTokenRejected,
                         "Endpoint does not support the user identity type provided.");
                 }
 

Libraries/Opc.Ua.Server/Session/Session.cs

@@ -902,7 +902,7 @@ private UserIdentityToken ValidateUserIdentityToken(
 
                     if (!found)
                     {
-                        throw ServiceResultException.Create(StatusCodes.BadUserAccessDenied, "Anonymous user token policy not supported.");
+                        throw ServiceResultException.Create(StatusCodes.BadIdentityTokenRejected, "Anonymous user token policy not supported.");
                     }
                 }