Enable windows driver components for k8s minor staging overlays

[saikat-royc]

What type of PR is this?

Uncomment only one /kind <> line, hit enter to put that in a new line, and remove leading whitespaces from that line:

/kind api-change
/kind bug
/kind cleanup
/kind design
/kind documentation
/kind failing-test
/kind feature
/kind flake

What this PR does / why we need it:

1. Bump staging images to use latest 1.2.0-gke.8 driver image
2. Enable windows driver components

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

[saikat-royc]

stable-1-18, 1-19 removes windows specfic roles. Hence for testing staging builds, directly importing from base is easier.
https://github.com/kubernetes-sigs/gcp-compute-persistent-disk-csi-driver/blob/master/deploy/kubernetes/overlays/stable-1-18/no_win_roles.yaml

[saikat-royc]

/assign @jingxu97

[jingxu97]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jingxu97, saikat-royc

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