fix: trim slash in RemoveSmbGlobalMapping

[andyzhangx]

What type of PR is this?
/kind bug

What this PR does / why we need it:
fix: trim slash in RemoveSmbGlobalMapping

I0419 05:10:41.566746    5668 safe_mounter_host_process_windows.go:145] remote server path: UNC\f95c76592b2ac4bcb957ad4.file.core.windows.net\pre-provisioned-multiple-pods\, local path: c:\var\lib\kubelet\plugins\kubernetes.io\csi\file.csi.azure.com\ff618e8b87f48350191c3ebae8902d9c38e17ee1b1913422f168f2865355330c\globalmount
I0419 05:10:41.567453    5668 smb.go:110] checking file ff618e8b87f48350191c3ebae8902d9c38e17ee1b1913422f168f2865355330c
I0419 05:10:41.567529    5668 smb.go:114] skip current mount path c:\var\lib\kubelet\plugins\kubernetes.io\csi\file.csi.azure.com\ff618e8b87f48350191c3ebae8902d9c38e17ee1b1913422f168f2865355330c\globalmount
I0419 05:10:41.567560    5668 smb.go:85] begin to run RemoveSmbGlobalMapping with \\f95c76592b2ac4bcb957ad4.file.core.windows.net\pre-provisioned-multiple-pods\
I0419 05:10:41.569358    5668 util.go:76] Executing command: "C:\\WINDOWS\\System32\\WindowsPowerShell\\v1.0\\powershell.exe -Mta -NoProfile -Command Remove-SmbGlobalMapping -RemotePath $Env:smbremotepath -Force"
E0419 05:10:42.663584    5668 safe_mounter_host_process_windows.go:151] RemoveSmbGlobalMapping(c:\var\lib\kubelet\plugins\kubernetes.io\csi\file.csi.azure.com\ff618e8b87f48350191c3ebae8902d9c38e17ee1b1913422f168f2865355330c\globalmount) failed with UnmountSmbShare failed. output: "Remove-SmbGlobalMapping : No MSFT_SmbGlobalMapping objects found with property 'RemotePath' equal to \r\n'\\\\f95c76592b2ac4bcb957ad4.file.core.windows.net\\pre-provisioned-multiple-pods\\'.  Verify the value of the property \r\nand retry.\r\nAt line:1 char:1\r\n+ Remove-SmbGlobalMapping -RemotePath $Env:smbremotepath -Force\r\n+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\r\n    + CategoryInfo          : ObjectNotFound: (\\\\f95c76592b2ac...-multiple-pods\\:String) [Remove-SmbGlobalMapping], Ci \r\n   mJobException\r\n    + FullyQualifiedErrorId : CmdletizationQuery_NotFound_RemotePath,Remove-SmbGlobalMapping\r\n \r\n", err: exit status 1

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: trim slash in RemoveSmbGlobalMapping

[k8s-ci-robot]

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This pull-request has been approved by: andyzhangx

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[andyzhangx]

/retest

[andyzhangx]

/retest

[andyzhangx]

/retest

[andyzhangx]

/retest

[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-azurefile-csi-driver-e2e-capz-windows-2022-hostprocess	f09cb7d	link	true	/test pull-azurefile-csi-driver-e2e-capz-windows-2022-hostprocess

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