detect if a regex escape is needed in a pytest match statement

Sometimes `re.escape` are needed in pytest for `match=...` arguments.
Then the string is modified and the regex escape is no longer needed.
It would be great if ruff could detect this and remove the unneeded `re.escape`.

M~WE:

```python
import pytest, re

with pytest.raises(Exception, match=re.escape("regexnotneeded")):
    ...
```