Automatic merge from submit-queue (batch tested with PRs 39373, 41585, 41617, 41707, 39958)

Fix ConfigMaps for Windows

**What this PR does / why we need it**: ConfigMaps were broken for Windows as the existing code used linux specific file paths. Updated the code in `kubelet_getters.go` to use `path/filepath` to get the directories. Also reverted back the code in `secret.go` as updating `kubelet_getters.go` to use `path/filepath` also fixes `secrets`

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes https://github.com/kubernetes/kubernetes/issues/39372

```release-note
Fix ConfigMap for Windows Containers.
```

cc: @pires