`barry_as_FLUFL` future flag does not work in new REPL

# Bug report

New REPL:

```python
>>> from __future__ import barry_as_FLUFL
>>> 1 <> 2
  File "<python-input-1>", line 1
    1 <> 2
      ^^
SyntaxError: invalid syntax
```

Old REPL:

```python
>>> from __future__ import barry_as_FLUFL
>>> 1 <> 2
True
```

I understand that this is just an easter egg :)



### Linked PRs
* gh-124999
* gh-125475