Config: Fixes bug where timeouts for alerting was not parsed correctly (#16784)

* Fix parsing of the config

* Remove unnecessary conversion

* Remove timeout modification

Co-Authored-By: aocenas <mr.ocenas@gmail.com>

* Remove unused import

pkg/services/alerting/notifier.go

@@ -3,7 +3,6 @@ package alerting
 import (
 	"errors"
 	"fmt"
-	"time"
 
 	"github.com/grafana/grafana/pkg/bus"
 	"github.com/grafana/grafana/pkg/components/imguploader"
@@ -127,7 +126,7 @@ func (n *notificationService) uploadImage(context *EvalContext) (err error) {
 	renderOpts := rendering.Opts{
 		Width:           1000,
 		Height:          500,
-		Timeout:         time.Duration(setting.AlertingEvaluationTimeout.Seconds() * 0.9),
+		Timeout:         setting.AlertingEvaluationTimeout,
 		OrgId:           context.Rule.OrgId,
 		OrgRole:         m.ROLE_ADMIN,
 		ConcurrentLimit: setting.AlertingRenderLimit,