fix: unmount detection failure

[andyzhangx]

What type of PR is this?
/kind bug

What this PR does / why we need it:
fix: unmount detection failure, e.g.

[pod/csi-smb-node-9gsbm/smb] I0721 13:07:21.684481       1 mount_linux.go:274] Cannot create temp dir to detect safe 'not mounted' behavior: mkdir /tmp/kubelet-detect-safe-umount1826812735: read-only file system

it's not a good idea to set readOnlyRootFilesystem: true on smb container

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:

none

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: andyzhangx

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Needs approval from an approver in each of these files:

• OWNERS [andyzhangx]

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[coveralls]

Pull Request Test Coverage Report for Build 10054894529

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 79.093%

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Totals
Change from base Build 10028883646:	0.0%
Covered Lines:	942
Relevant Lines:	1191

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💛 - Coveralls