code coverage for storagequota

[kavyashree-r]

What this PR does / why we need it:

Which issue this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged): fixes #

Testing done:
A PR must be marked "[WIP]", if no test result is provided. A WIP PR won't be reviewed, nor merged.
The requester can determine a sufficient test, e.g. build for a cosmetic change, E2E test in a predeployed setup, etc.
For new features, new tests should be done, in addition to regression tests.
If jtest is used to trigger precheckin tests, paste the result after jtest completes and remove [WIP] in the PR subject.
The review cycle will start, only after "[WIP]" is removed from the PR subject.

Special notes for your reviewer:

Release note:

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: kavyashree-r
Once this PR has been reviewed and has the lgtm label, please assign chethanv28 for approval. For more information see the Kubernetes Code Review Process.

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[k8s-ci-robot]

@kavyashree-r: 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-vsphere-csi-driver-unit-test	ca172fb	link	true	/test pull-vsphere-csi-driver-unit-test

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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