Finalize Default Widget Extension Telemetry

Context

We're trying to add more default telemetry to the MR Widgets.

"Problem"

The current rough draft implementation is effective for its purpose (dual: determine feasibility and set a general architecture), but now needs to move from "Spike Implementation" to "Final Implementation."

Tasks

1. (Out of Scope) Fix constant teardown/reconstruction of the extensions
2. Ensure reporting architecture meets all stakeholder needs:
   • Widget extension authors find it painless to use
   • PM(s) get the data they need
   • Engineers can extend the existing framework effectively to add:
     • new destinations beyond Redis
     • new behaviors
     • new events
3. Confirm user UI behaviors map correctly to the expected tracking events
4. Write unit tests

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Stat	Value	Description
Type	Feature	Technically, this is part of a refactor, but this is fundamentally new work.
Weight	frontend-weight2	Weighting this a frontend 2 because it should be unsurprising and straightforward.