[native][web] Handle use_new_flow for Identity V1 login calls

Summary:
Address ENG-9717

For V1 login we can reuse existing logic for unsupported_version to also work for use_new_flow. Desired behavior is the same.
Updated all Identity callsites.

Depends on D13954

Test Plan: Mocked local Identity to return use_new_flow for all login RPCs. Confirmed that login attempt on device fails and a message is displayed

Reviewers: varun, kamil

Reviewed By: kamil

Subscribers: ashoat, tomek

Differential Revision: https://phab.comm.dev/D14032