[functions/scopes]: use CONSTANT_CASE for variable (#2871)

Fixes #2863

Author: Ace Nassri

functions/concepts/scopes/src/main/java/functions/Scopes.java

@@ -30,7 +30,7 @@ public class Scopes implements HttpFunction {
   // Global (instance-wide) scope
   // This computation runs at instance cold-start.
   // Warning: Class variables used in functions code must be thread-safe.
-  private static final int InstanceVar = heavyComputation();
+  private static final int INSTANCE_VAR = heavyComputation();
 
   @Override
   public void service(HttpRequest request, HttpResponse response)
@@ -40,7 +40,7 @@ public void service(HttpRequest request, HttpResponse response)
     int functionVar = lightComputation();
 
     var writer = new PrintWriter(response.getWriter());
-    writer.printf("Instance: %s; function: %s", InstanceVar, functionVar);
+    writer.printf("Instance: %s; function: %s", INSTANCE_VAR, functionVar);
   }
 
   private static int lightComputation() {