fix: check and report error on loading the check runners

Author: Juanadelacuesta

policy/handler.go

@@ -137,7 +137,10 @@ func NewPolicyHandler(config HandlerConfig) (*Handler, error) {
 		state:               StateIdle,
 	}
 
-	h.loadCheckRunners()
+	err := h.loadCheckRunners()
+	if err != nil {
+		return nil, fmt.Errorf("unable to load the checks for the handler: %w", err)
+	}
 
 	currentStatus, err := h.runTargetStatus()
 	if err != nil {

policy/handler_oss.go

@@ -14,8 +14,6 @@ import (
 
 type HistoricalAPMGetter interface{}
 
-type noopHistoricalAPMGetter struct{}
-
 type noopVerticalCheckRunner struct {
 	policy *sdk.ScalingPolicy
 }