14a4699ff1
Following https://github.com/facebook/react/pull/30436 Concurrent by default strategy has been unshipped. Here we clean up the `allowConcurrentByDefault` path and related logic/tests. For now, this keeps the `concurrentUpdatesByDefaultOverride` argument in `createContainer` and `createHydrationContainer` and ignores the value to prevent more breaking changes to `react-reconciler` in the RC stage.