Change metrics-server pull policy to IfNotPresent

[oradwell]

In metrics-server addon deployment spec imagePullPolicy is set to Always. This means Kubernetes will never cache this image

Fixes #10064

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[minikube-bot]

Can one of the admins verify this patch?

[oradwell]

I signed it

[sharifelgamal]

/ok-to-test

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: oradwell, tstromberg

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[tstromberg]

Thank you!