Same registration graphql_www envelope as RegistrationGraphqlCall, but
with a server-only inner payload. Android uses this for the slim partial
account completion call after the first create.account response returns a
server-issued ig_partially_created_reg_info token.
Same registration graphql_www envelope as
RegistrationGraphqlCall, but with a server-only inner payload. Android uses this for the slim partial account completion call after the first create.account response returns a server-issuedig_partially_created_reg_infotoken.