Fix bug for checkpoint saving on multi node training setting
Author: dumpmemory
Pull request: yes

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Fixes # (issue)

fix bug on multi node training setting with shared file system
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Comments:
@muellerzr Is this a regression fix like #28009 or resolving an existing bug?

@amyeroberts regression fix, includes a fix for the same issue but on multinode. 

cc @thundergolfer too since I know you're trying to keep an eye on them all :)

Thanks @dumpmemory. Another edge case squashed!