Handle 403 responses with attached message. Modify previous default message, which was confusing (#565)

Author: tcrespog

src/main/java/io/seqera/tower/cli/utils/ResponseHelper.java

@@ -96,7 +96,8 @@ public static void errorMessage(PrintWriter err, Exception e) {
                     break;
 
                 case 403:
-                    print(err, "Unknown. Check that the provided identifier is correct.");
+                    String errorMessage = decodeMessage(ex);
+                    print(err, (errorMessage == null ? "Forbidden" : errorMessage) + ".");
                     break;
 
                 default: