Fixes create cluster timeout bug (#38)

Description of changes:
Current waiting time in test file isn't enough for creating cluster. e2e test fails sometimes because cluster is still creating. Adds more wait time for creating cluster step.

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Author: kyriechen96

test/e2e/scenarios/Cluster/cluster_memory_validations.yaml

@@ -22,7 +22,7 @@ steps:
         conditions:
           ACK.ResourceSynced:
             status: "True"
-            timeout: 7200
+            timeout: 14400
 
   - id: "PERFORM_SCALE_DOWN"
     description: "Perform scale down"