fix: remove forceUmount and lazyUmount

[andyzhangx]

What type of PR is this?
/kind bug

What this PR does / why we need it:
fix: remove forceUmount and lazyUmount
This PR is reverting https://github.com/kubernetes-sigs/azurefile-csi-driver/pull/569since “umount -f -l” (linux force umount & lazy umount) would make the smb mount dir broken(pointing to an invalid device) when there is heavy read write on the smb mount dir to be unmounted.

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: remove forceUmount and lazyUmount

[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 4210344614

• 2 of 2 (100.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.9%) to 85.744%

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Totals
Change from base Build 4209056675:	0.9%
Covered Lines:	812
Relevant Lines:	947

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💛 - Coveralls