add 8gb profile with 2.0 image

testing/benchmark/system-profiles/8GBx1zone.tfvars

@@ -2,18 +2,20 @@ user_name = "USER"
 
 # APM bench
 
+stack_version = "8.16.0-SNAPSHOT"
+ess_region = "gcp-us-west2"
+deployment_template = "gcp-cpu-optimized"
+
 worker_instance_type = "c6i.xlarge"
+worker_region = "us-west-2"
 
 # Elastic Cloud
 
-# The number of AZs the APM Server should span.
+apm_server_size = "8g"
 apm_server_zone_count = 1
-# The Elasticsearch cluster node size.
+
 elasticsearch_size = "64g"
-# The number of AZs the Elasticsearch cluster should have.
 elasticsearch_zone_count = 2
-# APM server instance size
-apm_server_size = "8g"
 
 # Standalone