simplify try_wait_until logic

Author: mabdinur

spec/datadog/opentelemetry/metrics_spec.rb

@@ -58,12 +58,7 @@ def get_testagent_metrics
 
       parsed = JSON.parse(response.body, symbolize_names: false)
       next parsed if parsed.is_a?(Array) && !parsed.empty?
-
-      if parsed.is_a?(Hash)
-        metrics_array = parsed['metrics']
-        next metrics_array if metrics_array.is_a?(Array) && !metrics_array.empty?
-        next [parsed]
-      end
+      next parsed['metrics'] if parsed.is_a?(Hash) && parsed['metrics'].is_a?(Array) && !parsed['metrics'].empty?
     end
   end