Drop unneeded namespace prefix in scalar type extension spec

Author: jwils

elasticgraph-json_ingestion/spec/unit/elastic_graph/json_ingestion/schema_definition/schema_elements/scalar_type_extension_spec.rb

@@ -98,7 +98,7 @@ def scalar_coercion_adapter_path
           end
 
           def build_api
-            schema_elements = ::ElasticGraph::SchemaArtifacts::RuntimeMetadata::SchemaElementNames.new(form: "snake_case")
+            schema_elements = SchemaArtifacts::RuntimeMetadata::SchemaElementNames.new(form: "snake_case")
             ::ElasticGraph::SchemaDefinition::API.new(
               schema_elements,
               true,