[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