Replace os.system() calls with pathlib for cross-platform test compatibility

[Copilot]

Tests used os.system("touch ...") and os.system("mkdir ...") which are non-portable to Windows and vulnerable to path injection with spaces or special characters.

Changes

• Replaced os.system("touch ...") with pathlib.Path(...).touch()
• Replaced os.system("mkdir ...") with Path(...).mkdir()
• Imported pathlib.Path module

Example

# Before
os.system(f"touch {join(self.working_dir.name, 'test_file.txt')}")
os.system(f"mkdir {join(self.working_dir.name, 'test_dir')}")

# After
Path(self.working_dir.name, 'test_file.txt').touch()
Path(self.working_dir.name, 'test_dir').mkdir()

Affects test_resolve_ingress_paths, test_ingress_path_filtering, and test_resolve_ingress_paths_skip_symlinks.

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[nutjob4life]

Delta: ✓
Tests: ✓
Approval: ✅
Tox details:

  py313: OK (22.33=setup[1.71]+cmd[20.63] seconds)
  docs: OK (1.18=setup[0.56]+cmd[0.62] seconds)
  lint: OK (2.77=setup[0.01]+cmd[2.76] seconds)
  congratulations :) (26.36 seconds)