Adds some logging to assist with troubleshooting https://github.com/flutter/flutter/issues/152220 (which is a reapperance of flake https://github.com/flutter/flutter/issues/146879) on CI. TL;DR [the tool sometimes never receives the `IsolateRunnable` event from the vm service after calling `_flutter.runInView`](https://github.com/flutter/flutter/issues/146879#issuecomment-2118629953).