Enable addtional linters (#34085)

enable mirror, usestdlibbars and perfsprint 
part of: https://github.com/go-gitea/gitea/issues/34083

---------

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

modules/indexer/internal/elasticsearch/indexer.go

@@ -5,6 +5,7 @@ package elasticsearch
 
 import (
 	"context"
+	"errors"
 	"fmt"
 
 	"code.gitea.io/gitea/modules/indexer/internal"
@@ -36,10 +37,10 @@ func NewIndexer(url, indexName string, version int, mapping string) *Indexer {
 // Init initializes the indexer
 func (i *Indexer) Init(ctx context.Context) (bool, error) {
 	if i == nil {
-		return false, fmt.Errorf("cannot init nil indexer")
+		return false, errors.New("cannot init nil indexer")
 	}
 	if i.Client != nil {
-		return false, fmt.Errorf("indexer is already initialized")
+		return false, errors.New("indexer is already initialized")
 	}
 
 	client, err := i.initClient()
@@ -66,10 +67,10 @@ func (i *Indexer) Init(ctx context.Context) (bool, error) {
 // Ping checks if the indexer is available
 func (i *Indexer) Ping(ctx context.Context) error {
 	if i == nil {
-		return fmt.Errorf("cannot ping nil indexer")
+		return errors.New("cannot ping nil indexer")
 	}
 	if i.Client == nil {
-		return fmt.Errorf("indexer is not initialized")
+		return errors.New("indexer is not initialized")
 	}
 
 	resp, err := i.Client.ClusterHealth().Do(ctx)