Add aws environments to the statistics

but only with the field usedRunners.

internal/runner/aws_manager.go

@@ -45,3 +45,22 @@ func (a AWSRunnerManager) Return(r Runner) error {
 	}
 	return nil
 }
+
+// EnvironmentStatistics returns only the used runner for each environment as the prewarming is handled
+// by AWS transparently.
+func (a AWSRunnerManager) EnvironmentStatistics() map[dto.EnvironmentID]*dto.StatisticalExecutionEnvironmentData {
+	environments := a.AbstractManager.EnvironmentStatistics()
+
+	for _, r := range a.usedRunners.List() {
+		workload, isAWSRunner := r.(*AWSFunctionWorkload)
+		if !isAWSRunner {
+			log.WithField("workload", workload).Error("Stored runners must be AWS runner")
+			continue
+		}
+
+		environmentID := workload.environment.ID()
+		environments[environmentID].UsedRunners++
+	}
+
+	return environments
+}