update to FLINK_ENVIRONMENT_NAME

Author: jaehyeon-kim

resources/flex/config/setup.env

@@ -2,7 +2,7 @@
 FLINK_REST_URL=http://jobmanager:8081
 
 ## Optional environment configs:
-ENVIRONMENT_NAME=Local Flink Cluster
+FLINK_ENVIRONMENT_NAME=Local Flink Cluster
 # Allow users to submit+upload jobs
 ALLOW_FLINK_SUBMIT=true
 # Allow users to terminate Flink jobs