[New Rule] `if k in d: del d[k]`

## Explanation

When removing a key from a dictionary, there's no need to check for its existence, as the end results will be the same anyway. Thus, `dict.pop(key, None)` is preferred.

Also see [this issue at @astral-sh/ruff](https://github.com/astral-sh/ruff/issues/7537).

## Example

```python
if key in dictionary:
    del dictionary[key]

# Good
dictionary.pop(key, None)
```