sfdisk: Read GPT type and attributes at scanning
The GPT type and attributes can be set since the commits 0529ebfb (Add support for setting the specific GPT type) and 0ffec31e (Add new job to set the GPT partition attributes).
But these two data from existing partitions are not read and are missing though.
This reads the GPT type and attributes data at scanning from the json output, after the GPT name/label and uuid are read.