use listPathRaw for HealObjects() instead of expensive WalkVersions() (#11675)

cmd/admin-heal-ops.go

@@ -22,7 +22,6 @@ import (
 	"fmt"
 	"net/http"
 	"sort"
-	"strings"
 	"sync"
 	"time"
 
@@ -883,11 +882,6 @@ func (h *healSequence) healMinioSysMeta(objAPI ObjectLayer, metaPrefix string) f
 				return errHealStopSignalled
 			}
 
-			// Skip metacache entries healing
-			if strings.HasPrefix(object, "buckets/.minio.sys/.metacache/") {
-				return nil
-			}
-
 			err := h.queueHealTask(healSource{
 				bucket:    bucket,
 				object:    object,