[GraphQL] use official skylight support

Gemfile.lock

@@ -614,9 +614,9 @@ GEM
       rack (~> 2.0)
       rack-protection (= 2.0.5)
       tilt (~> 2.0)
-    skylight (3.1.2)
-      skylight-core (= 3.1.2)
-    skylight-core (3.1.2)
+    skylight (4.2.1)
+      skylight-core (= 4.2.1)
+    skylight-core (4.2.1)
       activesupport (>= 4.2.0)
     smart_listing (1.2.2)
       coffee-rails

app/graphql/api/v2/schema.rb

@@ -73,5 +73,4 @@ class Api::V2::Schema < GraphQL::Schema
   end
 
   use GraphQL::Batch
-  use GraphQL::Tracing::SkylightTracing
 end

config/application.rb

@@ -49,5 +49,7 @@ module TPS
       debounce_delay: 3000,
       status_visible_duration: 6000
     }
+
+    config.skylight.probes += [:graphql]
   end
 end