Unused/duplicate function purge_soft_deleted_blob

This seems to be a copy/paste of the preceding function get_deleted_blobs with a different name, but it's not used anywhere...

Line 59 in 16ff750

def purge_soft_deleted_blob(blob_service_client: BlobServiceClient) -> list:

Hey @dayland, I am interested to work on this issue. Can you please assign it to me?