fix: skipping checking active volumes with the same number of files at the moment (#4893)

* fix: skipping checking active volumes with the same number of files at the moment
 https://github.com/seaweedfs/seaweedfs/issues/4140

* refactor with comments
https://github.com/seaweedfs/seaweedfs/issues/4140

* add TestShouldSkipVolume

---------

Co-authored-by: Konstantin Lebedev <9497591+kmlebedev@users.noreply.github.co>

weed/server/constants/volume.go

@@ -0,0 +1,5 @@
+package constants
+
+const (
+	VolumePulseSeconds = 5
+)

weed/server/volume_grpc_admin.go

@@ -240,6 +240,8 @@ func (vs *VolumeServer) VolumeStatus(ctx context.Context, req *volume_server_pb.
 	volumeSize, _, _ := v.DataBackend.GetStat()
 	resp.IsReadOnly = v.IsReadOnly()
 	resp.VolumeSize = uint64(volumeSize)
+	resp.FileCount = v.FileCount()
+	resp.FileDeletedCount = v.DeletedCount()
 
 	return resp, nil
 }