Notifications on frontend

[sanyavertolet]

trafficstars

We need to notify user in some cases:

1. Fetching test suites source - now we silently send a request to fetch test suites from source
2. Run and rerun requests - now we display that run/rerun request was sent, but we do not display that an execution is finished.

The first case is more important now than the second, but we still need to do something with that later (maybe with #106 👀)

[orchestr7]

@0x6675636b796f75676974687562 it's your good chance :)