[web] update grpc-web codegen'd files

Summary: since @ashoat and i last updated the codegen'd files, i've introduced and removed RPCs from the identity_client.proto file. this diff makes the corresponding codegen changes.

Test Plan: ran flow and also used this patch to test: https://gist.github.com/vdhanan/15ffc5810425b8a22b7d3c5bd01a8d58

Reviewers: ashoat

Reviewed By: ashoat

Subscribers: tomek, wyilio, ashoat

Differential Revision: https://phab.comm.dev/D9792