make gid allocator work with cross account feature

[RomanBednar]

Is this a bug fix or adding new feature?

Bug.

What is this PR about? / Why do we need it?

Cross account feature is broken. GID allocator must use localCloud created during CreateVolume which takes cross account feature into account. Without this change the driver attempts to list/describe access points and fails:

  Warning  ProvisioningFailed  29m (x6 over 47m)  efs.csi.aws.com_ip-10-0-30-56_e49a0a8c-a449-4a7c-bee5-9113112cd270  (combined from similar events): failed to provision volume with StorageClass "efs-crossaccount-sc": rpc error: code = Internal desc = Failed to discover used GIDs for filesystem: fs-04cbcb7d2b03a38a4: failed to list access points: FileSystemNotFound: File system 'fs-04cbcb7d2b03a38a4' does not exist.
{
  RespMetadata: {
    StatusCode: 404,
    RequestID: "1474ec74-cd0c-4a4d-b363-f792418b7e35"
  },
  ErrorCode: "FileSystemNotFound",
  Message_: "File system 'fs-04cbcb7d2b03a38a4' does not exist."
}

What testing is done?

Unit tests + manual testing including cross account configuration described here: https://github.com/kubernetes-sigs/aws-efs-csi-driver/blob/1203d4163e777b421617288fb5769203d3239d33/examples/kubernetes/cross_account_mount/README.md

[jsafrane]

/lgtm

[jsafrane]

/assign @mskanth972 @Ashley-wenyizha
for approval

[mskanth972]

/lgtm

[mskanth972]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mskanth972, RomanBednar

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