Disable CI tests for drivetrain-ha-clusters cluster

Change-Id: I6a81a8b106025b5e21a02dbf870478ed0aaf9eee
diff --git a/classes/cluster/drivetrain-ha-clusters/infra/init.yml b/classes/cluster/drivetrain-ha-clusters/infra/init.yml
index 3ff0bcd..0b45425 100644
--- a/classes/cluster/drivetrain-ha-clusters/infra/init.yml
+++ b/classes/cluster/drivetrain-ha-clusters/infra/init.yml
@@ -1,4 +1,6 @@
 parameters:
+  _jenkins:
+    tests_enabled: false
   _param:
     cluster_domain: drivetrain-ha-clusters.local
     cluster_name: drivetrain-ha-clusters