request only 1 best version for latest version resolution (#14625)

ListObjects, ListObjectsV2 calls are being heavily taxed when
there are many versions on objects left over from a previous
release or ILM was never setup to clean them up. Instead
of being absolutely correct at resolving the exact latest
version of an object, we simply rely on the top most 1
version and resolve the rest.

Once we have obtained the top most "1" version for
ListObject, ListObjectsV2 call we break out.

cmd/metacache-set.go

@@ -571,6 +571,13 @@ func (er *erasureObjects) listPath(ctx context.Context, o listPathOptions, resul
 		bucket:    o.Bucket,
 	}
 
+	// Maximum versions requested for "latest" object
+	// resolution on versioned buckets, this is to be only
+	// used when o.Versioned is false
+	if !o.Versioned {
+		resolver.requestedVersions = 1
+	}
+
 	ctxDone := ctx.Done()
 	return listPathRaw(ctx, listPathRawOptions{
 		disks:         disks,