`FBT001` and `PLR0917` - false positive on pytest functions

```py
# test_foo.py
@fixture
def a():
return True

def test_foo(a: bool): # error: FBT001
assert a
```

also happens on hook functions
```py
# conftest.py
def pytest_foo(a: bool): # error: FBT001
...
```

arguments to functions called by pytest are always positional, as they are called by pytest itself so this rule is not an issue.

Start by tracing the FBT001 and PLR0917 checks against the pytest examples in the issue, including test_foo and pytest_foo. Done means pytest-called test and hook functions no longer produce these false positives while the rules still report applicable ordinary functions.

Written by the indexing model from the issue text.