disk: re-implement StagingTargetPath cleanup logic

[huww98]

What type of PR is this?

/kind bug

What this PR does / why we need it:

We should unlink the file we created for volumeDevice.

We should check targetPath is not mounted before we check for volumeDevice, in case the user has a file with the same name.

And the overall complexity is greatly reduced. We do not call stat() on the mounted path now, so no need to worry about EIO or similar.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

This is necessary for csi-sanity test case to pass.

Does this PR introduce a user-facing change?

NONE

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

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/lifecycle stale

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/lifecycle rotten

[huww98]

Use the just merged CleanupSimpleMount

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/close

[k8s-ci-robot]

@k8s-triage-robot: Closed this PR.

In response to this:

The Kubernetes project currently lacks enough active contributors to adequately respond to all issues and PRs.

This bot triages PRs according to the following rules:

• After 90d of inactivity, lifecycle/stale is applied
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/close

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[huww98]

/reopen
/remove-lifecycle rotten

[k8s-ci-robot]

@huww98: Reopened this PR.

In response to this:

/reopen
/remove-lifecycle rotten

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