Add pod priority class to provisioner helm chart

[dubuc]

This PR is to allow providing a priority class name to the local volume provisioner Helm chart. This PR also sets the default priorityClassName to system-node-critical.

Thanks for reviewing!

@cofyc @msau42

[k8s-ci-robot]

Hi @dubuc. Thanks for your PR.

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[msau42]

/ok-to-test
/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dubuc, msau42

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