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Add error check and ignore unused variable (SA4006)
**What this PR does / why we need it**:
Fix some bugs in cloud provider vsphere, issue can be found here #66303
```pkg/cloudprovider/providers/vsphere/nodemanager.go:176:5: defers in this range loop won't run unless the channel gets closed (SA9001)
pkg/cloudprovider/providers/vsphere/vclib/diskmanagers/vmdm.go:129:8: this value of err is never used (SA4006)
pkg/cloudprovider/providers/vsphere/vsphere.go:596:34: argument ctx is overwritten before first use (SA4009)
pkg/cloudprovider/providers/vsphere/vsphere_test.go:360:2: this value of instanceID is never used (SA4006)
pkg/cloudprovider/providers/vsphere/vsphere_util.go:301:3: defers in this infinite loop will never run (SA5003)
```
**Special notes for your reviewer**:
I fixed ```SA4006``` report in that issue, but there are still other code needed to discuss and fix.
**Release note**:
```release-note
NONE
```
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