fix(logcollector): silent errors from saving of schema details

Silent collection schema details failure.
Now it fails in the K8S test. Need be fixed later

sdcm/tester.py

@@ -2958,6 +2958,7 @@ def clean_resources(self):
 
         self.destroy_credentials()
 
+    @silence(name='Save node schema')
     def save_nodes_schema(self):
         if self.db_cluster is None:
             self.log.info("No nodes found in the Scylla cluster")