CI/E2E: commenting for now single_node

We are investigating it in #1591.

Author: dannywillems

.github/workflows/tests.yaml

@@ -528,7 +528,7 @@ jobs:
     strategy:
       matrix:
         test:
-          - single_node
+          # - single_node
           - multi_node_initial_joining
           - multi_node_peer_discovery
           - multi_node_propagate_block