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bc44dc2a - [`flake8-use-pathlib`] Mark fixes unsafe for return type changes (`PTH104`, `PTH105`, `PTH109`, `PTH115`) (#21440)

[`flake8-use-pathlib`] Mark fixes unsafe for return type changes (`PTH104`, `PTH105`, `PTH109`, `PTH115`) (#21440) ## Summary Marks fixes as unsafe when they change return types (`None` → `Path`, `str`/`bytes` → `Path`, `str` → `Path`), except when the call is a top-level expression. Fixes #21431. ## Problem Fixes for `os.rename`, `os.replace`, `os.getcwd`/`os.getcwdb`, and `os.readlink` were marked safe despite changing return types, which can break code that uses the return value. ## Approach Added `is_top_level_expression_call` helper to detect when a call is a top-level expression (return value unused). Updated `check_os_pathlib_two_arg_calls` and `check_os_pathlib_single_arg_calls` to mark fixes as unsafe unless the call is a top-level expression. Updated PTH109 to use the helper for applicability determination. ## Test Plan Updated snapshots for `preview_full_name.py`, `preview_import_as.py`, `preview_import_from.py`, and `preview_import_from_as.py` to reflect unsafe markers. --------- Co-authored-by: Brent Westbrook <brentrwestbrook@gmail.com>