fix: change controllerKey and unitNumber to *int32

[skogta]

Description

Change the type if controllerKey and unitNumber to *int32 in CnsVolumeAttachDetachSpec.

Closes: #3883

How Has This Been Tested?

Complete govmomi testing logs:
Testing.rtf

    client_test.go:1226: Running shared disk tests
    client_test.go:1243: Attaching volume using the spec: {DynamicData:{} VolumeId:{DynamicData:{} Id:3d993b1a-32ea-4dae-80d8-91b1b693b5f0} Vm:VirtualMachine:vm-1022 DiskMode:independent_persistent Sharing:sharingMultiWriter ControllerKey:0xc00031c1dc UnitNumber:0xc00031c1d8}
    client_test.go:1268: Volume attached sucessfully with shared disk params. Disk UUID: 6000C299-269c-70ea-7ea7-87dbac4d3045
    client_test.go:1279: Detaching volume using the spec: {DynamicData:{} VolumeId:{DynamicData:{} Id:3d993b1a-32ea-4dae-80d8-91b1b693b5f0} Vm:VirtualMachine:vm-1022 DiskMode: Sharing: ControllerKey:<nil> UnitNumber:<nil>}
    client_test.go:1303: Volume detached sucessfully

CNS logs for attaching disk with controllerKey and UnitNumber:

2025-10-06T06:58:06.193Z INFO vsanvcmgmtd 114601 [vc@4413 sub="CnsVolMgr" opId="457b15ed"] Attaching volume with spec: (vim.cns.VolumeAttachDetachSpec) [
-->    (vim.cns.VolumeAttachDetachSpec) {
-->       volumeId = (vim.cns.VolumeId) {
-->          id = "3d993b1a-32ea-4dae-80d8-91b1b693b5f0"
-->       }, 
-->       vm = 'vim.VirtualMachine:vm-1022',
-->       diskMode = "independent_persistent",
-->       sharing = "sharingMultiWriter",  
-->       controllerKey = 1002, 
-->       unitNumber = 23
-->    }
--> ]

CNS logs for attaching disk without shared disk params:

2025-10-06T06:58:04.590Z INFO vsanvcmgmtd 114892 [vc@4413 sub="CnsVolMgr" opId="457b15e8"] DetachVolume with spec: (vim.cns.VolumeAttachDetachSpec) [
-->    (vim.cns.VolumeAttachDetachSpec) { 
-->       volumeId = (vim.cns.VolumeId) {
-->          id = "3d993b1a-32ea-4dae-80d8-91b1b693b5f0"
-->       }, 
-->       vm = 'vim.VirtualMachine:vm-1022',
-->    }
--> ]

Guidelines

Please read and follow the CONTRIBUTION guidelines of this project.

[tenthirtyam]

CI is faling on the DCO - commits need to be signed.

[tenthirtyam]

Can you open an issue and link the issue to this pull request for traceability?

[skogta]

@tenthirtyam I have addressed your comments.

[divyenpatel]

/approve

[tenthirtyam]

@skogta - please sign-off with your @broadcom.com email instead of legacy @vmware.com.

[skogta]

@prziborowski @tenthirtyam can I please get an approval? I have addressed your comments.