[`ruff`] Catch more dummy variable uses (`RUF052`) (#19799)
## Summary
Extends the `used-dummy-variable` rule
([RUF052](https://docs.astral.sh/ruff/rules/used-dummy-variable/)) to
detect dummy variables that are used within list comprehensions, dict
comprehensions, set comprehensions, and generator expressions, not just
regular for loops and function assignments.
### Problem
Previously, RUF052 only flagged dummy variables (variables with leading
underscores) that were used in function scopes via assignments or
regular for loops. It missed cases where dummy variables were used
within comprehensions:
```python
def example():
my_list = [{"foo": 1}, {"foo": 2}]
# These were not detected before:
[_item["foo"] for _item in my_list] # Should warn: _item is used
{_item["key"]: _item["val"] for _item in my_list} # Should warn: _item is used
(_item["foo"] for _item in my_list) # Should warn: _item is used
```
### Solution
- Extended scope checking to include all generator scopes () with any
(list/dict/set comprehensions and generator expressions)
`ScopeKind::Generator``GeneratorKind`
- Added support for bindings, which cover loop variables in both regular
for loops and comprehensions `BindingKind::LoopVar`
- Refactored the scope validation logic for better readability with a
descriptive variable `is_allowed_scope`
[ISSUE](https://github.com/astral-sh/ruff/issues/19732)
## Test Plan
```bash
cargo test
```
---------
Co-authored-by: Brent Westbrook <brentrwestbrook@gmail.com>
