Added Shell=True for windows flow. Fixes file not found error while r…

[PranoyD]

What type of PR is this?
/kind bug

What this PR does / why we need it:
Which issue(s) this PR fixes:
Fixes #2276

Special notes for your reviewer:
Does this PR introduce a user-facing change?
NONE
Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

[linux-foundation-easycla]

• ✅login: PranoyD / (2dfa782)

The committers listed above are authorized under a signed CLA.

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[yliaog]

please sign cla

[yliaog]

/release-note-none

[roycaihw]

/assign @yliaog

[yliaog]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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