[lib][web][native] rename SESSION_DOES_NOT_EXISTS -> SESSION_DOES_NOT_EXIST

Summary: https://phab.comm.dev/D13025#inline-75566

Test Plan: Build app, Flow, search for usage of SESSION_DOES_NOT_EXISTS and sessionDoesNotExists to make sure all are removed

Reviewers: tomek, marcin

Reviewed By: tomek

Subscribers: ashoat

Differential Revision: https://phab.comm.dev/D13171