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fix mount unmount failure for a Windows pod

**What this PR does / why we need it**:
`IsLikelyNotMountPoint` func does not return correctly, for invalid symlink, it should return true(not a mount point), now it will always return false:
https://github.com/kubernetes/kubernetes/blob/7711d8866112e89341d194c39bc6470a0ec88a72/pkg/util/mount/mount_windows.go#L141-L148

https://github.com/kubernetes/kubernetes/blob/7711d8866112e89341d194c39bc6470a0ec88a72/pkg/volume/util/util.go#L147-L163

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #63249

**Special notes for your reviewer**:

**Release note**:

```
fix mount unmount failure for a Windows pod
```

/sig windows
/assign @msau42