testing: refactor to new runState API

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

src/vs/workbench/api/common/extHost.api.impl.ts

@@ -1292,10 +1292,6 @@ export function createApiFactoryAndRegisterActors(accessor: ServicesAccessor): I
 				// checkProposedApiEnabled(extension);
 				return extHostTypes.TestMessageSeverity;
 			},
-			get TestState() {
-				// checkProposedApiEnabled(extension);
-				return extHostTypes.TestState;
-			},
 			get WorkspaceTrustState() {
 				// checkProposedApiEnabled(extension);
 				return extHostTypes.WorkspaceTrustState;