Using Synthetic Data on Wear OS 4

The [docs on the repo for using synthetic data state to use `adb`](https://github.com/android/health-samples/tree/b98ca9d21a361abe064a7661783191e8f575f034/health-services/MeasureDataCompose#try-it-with-synthetic-data); however, [the docs for Wear OS 4 say that is no longer needed](https://developer.android.com/health-and-fitness/guides/health-services/simulated-data) and that the emulator now natively supports these events.

How do I control the emulator to walk vs run, etc? I tried this slider in the emulator extended controls, but it seems to have no effect:

Does this repo work with Wear OS 4 and if so what are the steps for synthetic data on that OS?

Start with the synthetic-data instructions in health-services/MeasureDataCompose and compare them with the linked Wear OS 4 documentation. Determine the supported emulator workflow and controls, then update the repository documentation so the Wear OS version, required steps, and expected result are clear.

Written by the indexing model from the issue text.