[web] Remove apps as a tab in code logic

Summary:
issue: https://linear.app/comm/issue/ENG-3044/change-apps-tab-to-be-a-modal
Since the apps tab is a modal (since D6812) the code logic that considers it a tab should be removed.
file lib/utils/url-utils.js was only used on web, so the changes don't influence native

Test Plan: Run flow check in web/. Searched for any occurences of 'apps' on web and checked that this is all that needs to be changed

Reviewers: tomek, kamil, michal

Reviewed By: kamil

Subscribers: ashoat, atul

Differential Revision: https://phab.comm.dev/D6814