Update Live Activity to use new Local Stats Telemetry Message

[garthvh]

What changed?

The existing live activity uses the telemetry message sent over the phone api as the event tied to the timer (the only other way to update a live activity is via a server side notification, which is not great for an offgrid mesh.)

Why did it change?

It currently buzzes your phone every minute, and is the same data provided by device metrics. A new Local Stats telemetry message was added with more relevant mesh details and is sent every 15 minutes

How is this tested?

You can test this by long pressing on the connected node in the bluetooth tab and running the live activity

Screenshots/Videos (when applicable)

Checklist

• My code adheres to the project's coding and style guidelines.
• I have conducted a self-review of my code.
• I have commented my code, particularly in complex areas.
• I have made corresponding changes to the documentation.
• I have tested the change to ensure that it works as intended.