Two ratchets were red:
- windows-lane-tree-removal-boundary: the win32 spec's afterAll used raw
rmSync on a tree two icacls.exe children had just rewritten DACLs on, which
is the EPERM race removeTreeSync exists for.
- win32-test-lane-registration: the spec was in the pr.yml argv but not in
WINDOWS_PACKAGE_TESTS, so a future diff touching only test files would not
select package_windows and the spec would self-skip on ubuntu and report
success.