[flake8-use-pathlib] Avoid bytes-path false positives in PTH rules

[BerqiaMouad]

Summary

• suppress flake8-use-pathlib diagnostics when the relevant operand is bytes-backed
• apply the bytes-path guard in both the shared replacement helpers and the custom rule handlers that bypass them
• add a dedicated bytes_paths.py fixture and refresh the affected snapshots

This addresses #17699.

Testing

cargo test -p ruff_linter flake8_use_pathlib
cargo fmt --check
cargo clippy -p ruff_linter --all-targets -- -D warnings
target/debug/ruff check --isolated --select PTH208 - <<'PY'
import os
os.listdir(b'.')
PY
target/debug/ruff check --isolated --select PTH208 - <<'PY'
import os
os.listdir('.')
PY
target/debug/ruff check --isolated --select PTH123 - <<'PY'
open(b'foo')
PY
target/debug/ruff check --isolated --select PTH121 - <<'PY'
import os
os.path.samefile(b'a', 'a')
PY

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[ntBre]

Thanks for looking into this. Could you confirm that you've read and followed our AI policy before I review this?

[BerqiaMouad]

Thanks for looking into this. Could you confirm that you've read and followed our AI policy before I review this?

thank you for response, yes i read and followed it !