default partition metadata in vmap/scan/pmap#5508
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Fixes #5112.
vmap,scan, andpmapnow inject{PARTITION_NAME: None}intotransform_metadatawhen the key is absent, soout_shardingmetadata stays aligned with array rank after a transform adds an axis.Previously required the manual workaround:
Changes:
_default_transform_metadatahelper initeration.pyspmd.add_axis