[`flake8-executable`] `EXE001` flags ordinary `#!` comments as shebangs

[ntBre]

EXE001 treats an ordinary comment beginning with #! as a shebang even when it appears inside a function and does not specify an interpreter.

# test.py (not executable)
def f():
    #! regular comment
    return 1

$ ruff check --isolated --select EXE001 test.py
EXE001 Shebang is present but file is not executable
 --> test.py:3:5
  |
1 | # test.py (not executable)
2 | def f():
3 |     #! regular comment
  |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
4 |     return 1
  |

Found 1 error.

This probably applies to other shebang rules too since they all share ShebangDirective::try_extract. I guess I assumed that that would filter out "shebang" lines later in the file.