[native] remove call to setCommServicesAuthMetadata
Summary: we don't need this call anymore. processAuthResult in identity-service-context-provider.react.js handles calling setCommServicesAuthMetadata.
Test Plan: tested backup upload and restore protocol, both were successful
Reviewers: marcin, kamil
Reviewed By: kamil
Subscribers: bartek, ashoat, tomek
Differential Revision: https://phab.comm.dev/D12576