Add handling case of the interrupted connection with BE

[elfro]

STR:

1. Run the project: robo part, BE and FE
2. Open an application in the browser
3. Click on 'Play' icon to start streaming
4. Stop BE in the terminal
5. Return to the browser's tab.

Actual result: the stream process is still visually in progress, but in fact the connection with the server was interrupted.
Expected result: TBD show the spinner with attempts to reconnect and stop the process after N attempts.