Emit diagnostics for unsupported comparisons involving non-fixed-length tuples

Pyright, mypy and pyrefly all emit diagnostics on all four comparisons here, but ty currently does not emit any diagnostics on this snippet:

```py
def f(
    a: tuple[int, ...],
    b: tuple[str, ...],
    c: tuple[str]
):
    a < b
    b < a
    a < c
    c < a
```