os: on windows RemoveAll removing directories containing read-only files errors with `unlinkat ... Access is denied` [1.25 backport]

[gopherbot]

@qmuntal requested issue #75922 to be considered for backport to the next 1.25 minor release.

@gopherbot please backport. This is a regression in Go 1.25.

[gopherbot]

Change https://go.dev/cl/715360 mentions this issue: [release-branch.go1.25] os: support deleting read-only files in RemoveAll on older Windows versions

[gopherbot]

Closed by merging CL 715360 (commit 8097b19) to release-branch.go1.25.

[gopherbot]

Change https://go.dev/cl/718000 mentions this issue: [release-branch.go1.25] internal/syscall/windows: fix ReOpenFile sentinel error value