fix(publicip): abort ip data fetch if vpn context is canceled

- Prevents requesting the public IP address N times after N VPN failures
- Fetching runs with a context local to the 'single run'
- Single run writes single run result to a channel back to the caller, RunOnce is now blocking

internal/vpn/interfaces.go

@@ -89,6 +89,6 @@ type DNSLoop interface {
 }
 
 type PublicIPLoop interface {
-	StartSingleRun()
+	RunOnce(ctx context.Context) (err error)
 	ClearData() (err error)
 }