[web] Disable thread menu items that are not ready yet

Summary: Disable thread menu items that are not ready yet. Currently the menu will not appear until the functionalities will be implemented

Test Plan: After running web app the Thread actions menu should not appear now.

Reviewers: palys-swm

Reviewed By: palys-swm

Subscribers: benschac, ashoat, Adrian, atul, karol-bisztyga

Differential Revision: https://phabricator.ashoat.com/D3285