Bugfix: Only allow rank==0 to clean up old checkpoints (#2558)

kmn1024

2025-06-25 443bc09c11f3cf89ffc573aab2021f0c933aa5b3

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boy
boy
boy
boy
boy
boy
boy
girl
girl
pretty girl
cat
dog
dog
dog
rat
red faced clown
green caterpillar