Fixes: https://github.com/microsoft/vscode/issues/115101.
See issue for details.
- Adopts the new API
- Test results now persist across reloads (last 64 runs).
- Removed state grouping in favor of sorting option.
- Code lenses are disabled for now
The WorkspaceTestCollectionService duplicated collection logic
unnecessarily. Centralize to the TestService's collection.
This also moves the state updates for discovering tests, and a new
update for adding roots, into the diff, which lets us synchronize those
changes with the changes to test collections.
There's a super crazy bug with the "run all" action that I have
not dove into yet.
