[identity] bump native min supported version and add web min supported version

Summary:
bump native min supported version to 401, to resolve https://linear.app/comm/issue/ENG-9421/consider-marking-mobile-versions-below-401-unsupported-by-identity

also introducing a web min supported version and setting it to 120, which is the web equivalent of 401

Test Plan: changed min supported versions on staging identity to one higher than my dev native/web versions. was logged out on both platforms with an alert/modal explaining why. was alerted that i should update when i tried to log back in. then changed min supported versions back to 401/120 and could log in again

Reviewers: will

Reviewed By: will

Subscribers: ashoat, tomek

Differential Revision: https://phab.comm.dev/D13790