hotfix(health): debug log failed attempts and warn log all attempt errors if all failed

- Reduce "worrying" noise of icmp attempt failing
- Only log when an action (restart the VPN) is taken

internal/healthcheck/interfaces.go

@@ -3,6 +3,7 @@ package healthcheck
 type Logger interface {
 	Debugf(format string, args ...any)
 	Info(s string)
+	Infof(format string, args ...any)
 	Warnf(format string, args ...any)
 	Error(s string)
 }