fix(probe/ebpf): feed initial connections synchronously on restart

If we run `getInitialState()` async there is some chance we will see
another ebpf failure and call `useProcfs()` before `getInitialState()`
gets to the last line, whereupon it will crash on nil pointer.

Also it seems pointless to call `performEbpfTrack()` without waiting
for something to feed in, so I suspect this is what the original
author had in mind.

It will slow down this one `Report()` on machines with a lot of
processes or connections, but ebpfTracker restart is supposed to be a
rare event.

probe/endpoint/connection_tracker.go

@@ -86,7 +86,7 @@ func (t *connectionTracker) ReportConnections(rpt *report.Report) {
 			log.Warnf("ebpf tracker died, restarting it")
 			err := t.ebpfTracker.restart()
 			if err == nil {
-				go t.getInitialState()
+				t.getInitialState()
 				t.performEbpfTrack(rpt, hostNodeID)
 				return
 			}