Set up testing rewrite experiment (microsoft#21258)

is the beginning of this issue:
microsoft#21150, in that it will
start the process of implementing the setting in the extension

src/client/testing/testController/controller.ts

@@ -48,6 +48,8 @@ import { ITestDebugLauncher } from '../common/types';
 import { pythonTestAdapterRewriteEnabled } from './common/utils';
 import { IServiceContainer } from '../../ioc/types';
 import { PythonResultResolver } from './common/resultResolver';
+import { pythonTestAdapterRewriteEnabled } from './common/utils';
+import { IServiceContainer } from '../../ioc/types';
 
 // Types gymnastics to make sure that sendTriggerTelemetry only accepts the correct types.
 type EventPropertyType = IEventNamePropertyMapping[EventName.UNITTEST_DISCOVERY_TRIGGER];