Need to correctly handle dead sessions on frontend

Created by: karatheodory

Original bug: https://github.com/ExecutionLLC/VCFUtils/issues/115 Can be also reproduced by the following steps:

• login
• open another browser (or incognito mode in current)
• try to login
• on the warning window ("we have another session opened...") agree to close old one and start the new one
• return to the first window
• try to sort or do any operations and see the error message.

Expected: window appears which says the session is dead on WS. The window has Refresh and Re-Login buttons.