Populate VolumeError.ErrorCode field in VolumeAttachment object

[torredil]

What type of PR is this?

/kind api-change

What this PR does / why we need it:

KEP-4876: Mutable CSINode Allocatable Property introduces a new field in the VolumeError struct used in the VolumeAttachment object Status field:

// Captures an error encountered during a volume operation.
type VolumeError struct {
  // errorCode is a numeric gRPC code representing the error encountered during Attach or Detach operations.
    ErrorCode *int32
}

This change populates the field when a plugin's ControllerPublishVolume RPC returns an error.

Which issue(s) this PR fixes:

N/A

Special notes for your reviewer:

See API strategy for the VolumeAttachment object here:

https://github.com/kubernetes/kubernetes/blob/ee012e883f863a141cab35e5a76cbe5d378ad36f/pkg/registry/storage/volumeattachment/strategy.go#L138

Does this PR introduce a user-facing change?:

Populate VolumeError.ErrorCode field in VolumeAttachment object.

[torredil]

cc: @gnufied

[torredil]

/label tide/merge-method-squash

[jsafrane]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jsafrane, torredil

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