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

kmn1024

2025-06-25 443bc09c11f3cf89ffc573aab2021f0c933aa5b3

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st    Street
street    Street
expy    Expressway
fwy    Freeway
hwy    Highway
dr    Drive
ct    Court
ave    Avenue
av    Avenue
cir    Circle
blvd    Boulevard
alley    Alley
way    Way
jct    Junction