Increase container memory for mixer-autopush-observation and mixer-au… (#1683)

…topush-node

Increases mixer-autopush-observation to 6GB and mixer-autopush-node to
4GB

This is due to an increase in container restarts in autopush causing
flaky webdriver tests. It looks like they were terminating with 137
(OOM).

Author: n-h-diaz

deploy/helm_charts/envs/mixer_autopush.yaml

@@ -40,7 +40,13 @@ serviceGroups:
     replicas: 20
   observation:
     replicas: 20
+    resources:
+      memoryRequest: "6G"
+      memoryLimit: "6G"
   node:
     replicas: 20
+    resources:
+      memoryRequest: "4G"
+      memoryLimit: "4G"
   default:
     replicas: 10