[web] Change active tab based on active thread subscription

Summary: When thread is opened and it belongs to the other tab, we switch open tab to display correct one

Test Plan: Make sure that switch is happening when correct tab is not opened, check if sidebars are not causing switching

Reviewers: ashoat, palys-swm

Reviewed By: ashoat

Subscribers: zrebcu411, Adrian, atul, subnub, karol-bisztyga

Differential Revision: https://phabricator.ashoat.com/D700