dial: grpc naming is not compatible with windows unix socket

[tam7t]

What this PR does / why we need it:

Windows grpc connections are currently broken:

E0324 17:53:17.547284    6228 utils.go:79] GRPC error: failed to mount secrets store objects for pod default/nginx-secrets-store-inline-crd, err: rpc error: code = DeadlineExceeded desc = latest balancer error: connection error: desc = "transport: Error while dialing dial tcp: address unix://C:\\k\\secrets-store-csi-providers/azure.sock: too many colons in address"

Believe this was caused by #462 where grpc.Dial was replaced with grpc.DialContext.

Which issue(s) this PR fixes (optional, using fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when the PR gets merged):
Fixes #

Special notes for your reviewer:

[aramase]

/test pull-secrets-store-csi-driver-e2e-windows

[aramase]

/test pull-secrets-store-csi-driver-e2e-windows

[aramase]

/test pull-secrets-store-csi-driver-e2e-windows

rerunning because there were few flakes in the last run

[aramase]

Looking at the kubelet logs, the failure seems to be windows related:

E0324 20:00:34.516993    4368 cni.go:364] Error adding default_nginx-secrets-store-inline-crd/7f0098aba9421d5a4fc9984d50db88905f1ee173acb296179156984faa73f423 to network azure-vnet/azure: A virtual machine or container with the specified identifier does not exist.
E0324 20:00:34.516993    4368 cni_windows.go:59] error while adding to cni network: A virtual machine or container with the specified identifier does not exist.
W0324 20:00:34.516993    4368 docker_sandbox.go:400] failed to read pod IP from plugin/docker: networkPlugin cni failed on the status hook for pod "nginx-secrets-store-inline-crd_default": A virtual machine or container with the specified identifier does not exist.

I see in the logs that the csi driver is mounting correctly:

I0324 20:32:00.551056    5056 operation_generator.go:657] MountVolume.SetUp succeeded for volume "secrets-store-inline" (UniqueName: "kubernetes.io/csi/00f9264d-5a37-4e02-9ca5-abc01e10215a-secrets-store-inline") pod "nginx-secrets-store-inline-crd" (UID: "00f9264d-5a37-4e02-9ca5-abc01e10215a") 

[aramase]

/test pull-secrets-store-csi-driver-e2e-windows

[aramase]

/test pull-secrets-store-csi-driver-e2e-windows

[aramase]

/test pull-secrets-store-csi-driver-e2e-windows

[aramase]

/lgtm
/approve

[k8s-ci-robot]

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This pull-request has been approved by: aramase, tam7t

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