Remove preview flag for VS Code test runner, update tests and remove custom runner #3537
Description
There's a lot of tidying up that can be done when removing the old runner, including:
- Removing all the test view/tree classes
- Not firing
onDidChangeDatafor the entire tree on many changes - Simplify phantom group/hidden nodes in to
TestCoordinator? - Remove the durations from the
description(VS Code already adds them) - Remove commands that overlap with new VS Code commands, such as "Run test at cursor" etc.
- This may require better ranges for tests so that Run Test at Cursor works inside the body and not only on the start line
- Ensure "Clear Test Results" can still work