updating validation template

Author: Miqueasher

validator/src/main/resources/expected-data-template/python/ec2/default/aws-otel-custom-metrics.mustache

@@ -12,7 +12,7 @@
       value: {{serviceName}}
     -
       name: cloud.region
-      value: {{AWS_REGION}}
+      value: {{region}}
     -
       name: service.name
       value: {{serviceName}}
@@ -64,7 +64,7 @@
       value: {{serviceName}}
     -
       name: cloud.region
-      value: {{AWS_REGION}}
+      value: {{region}}
     -
       name: service.name
       value: {{serviceName}}
@@ -116,7 +116,7 @@
       value: {{serviceName}}
     -
       name: cloud.region
-      value: {{AWS_REGION}}
+      value: {{region}}
     -
       name: service.name
       value: {{serviceName}}