[command] bugfix: UserLabels read incompleted laberls.yaml #1759
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write to a tmp file and then rename to labels.yaml
if read before rename, we'll get an old file
if read after rename, we'll get a new file
this is safe because:
https://stackoverflow.com/questions/72997975/can-you-safely-read-a-file-which-is-target-of-mv-command