fix slow volume csi unit test

[carlory]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

before:

(⎈|kind-kind:N/A)➜  kubernetes git:(master) go test   k8s.io/kubernetes/pkg/volume/csi -cover -count=1
ok  	k8s.io/kubernetes/pkg/volume/csi	38.506s	coverage: 79.0% of statements

after:

(⎈|kind-kind:N/A)➜  kubernetes git:(fix-slow-volume-csi-test) go test  k8s.io/kubernetes/pkg/volume/csi -cover -count=1
ok  	k8s.io/kubernetes/pkg/volume/csi	18.857s	coverage: 79.0% of statements

Which issue(s) this PR fixes:

Ref #123685

Special notes for your reviewer:

Does this PR introduce a user-facing change?

NONE

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

[k8s-ci-robot]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[k8s-ci-robot]

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: carlory
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[k8s-ci-robot]

@carlory: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-kubernetes-unit	bfdcb2a	link	true	/test pull-kubernetes-unit

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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[k8s-triage-robot]

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This bot triages PRs according to the following rules:

• After 90d of inactivity, lifecycle/stale is applied
• After 30d of inactivity since lifecycle/stale was applied, lifecycle/rotten is applied
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/lifecycle stale