N805 fix should be suppressed when another variable is using the recommended name

[dscorbett]

Summary

The fix for invalid-first-argument-name-for-method (N805) should be suppressed when the recommended parameter name is already taken by another variable used within that scope.

$ cat >n805.py <<'# EOF'
class C:
    def f(this):
        self = type(this).__name__
        print(self, this.__sizeof__())
C().f()
# EOF

$ python n805.py
C 16

$ ruff --isolated check n805.py  --select N805 --unsafe-fixes --fix
Found 1 error (1 fixed, 0 remaining).

$ cat n805.py
class C:
    def f(self):
        self = type(self).__name__
        print(self, self.__sizeof__())
C().f()

$ python n805.py
C 42

Version

ruff 0.11.12 (aee3af0 2025-05-29)