Format ExprIfExp (ternary operator) (#5597)

## Summary

Format `ExprIfExp`, also known as the ternary operator or inline `if`.
It can look like
```python
a1 = 1 if True else 2
```
but also
```python
b1 = (
    # We return "a" ...
    "a" # that's our True value
    # ... if this condition matches ...
    if True # that's our test
    # ... otherwise we return "b§
    else "b" # that's our False value
)
```

This also fixes a visitor order bug.

The jaccard index on django goes from 0.911 to 0.915.

## Test Plan

I added fixtures without and with comments in strange places.

crates/ruff_python_ast/src/visitor/preorder.rs

@@ -476,8 +476,9 @@ where
             orelse,
             range: _range,
         }) => {
-            visitor.visit_expr(test);
+            // `body if test else orelse`
             visitor.visit_expr(body);
+            visitor.visit_expr(test);
             visitor.visit_expr(orelse);
         }