fix: disallow block volume capability

[andyzhangx]

What type of PR is this?
/kind bug

What this PR does / why we need it:
fix: disallow block volume capability
should return error for block volume capability

Which issue(s) this PR fixes:

Fixes #

Requirements:

• uses conventional commit messages
• includes documentation
• adds unit tests
• tested upgrade from previous version

Special notes for your reviewer:

Release note:

fix: disallow block volume capability

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: andyzhangx

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• OWNERS [andyzhangx]

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[coveralls]

Pull Request Test Coverage Report for Build 2140120290

• 13 of 14 (92.86%) changed or added relevant lines in 1 file are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage increased (+0.08%) to 85.698%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
pkg/smb/controllerserver.go	13	14	92.86%

Files with Coverage Reduction	New Missed Lines	%
pkg/smb/controllerserver.go	1	85.11%

Totals
Change from base Build 2115136144:	0.08%
Covered Lines:	761
Relevant Lines:	888

---

💛 - Coveralls

[k8s-ci-robot]

@andyzhangx: 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-csi-driver-smb-e2e-gce	4733104	link	true	/test pull-csi-driver-smb-e2e-gce

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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