VPA chart improvements

[jonkerj]

What type of PR is this?

What this PR does / why we need it:

The current chart does not support configuring priorityClassName, could have much tighter security settings and does not allow customization of security settings. It should fit the Pod Security Standard restricted after this PR too.

Which issue(s) this PR fixes:

If needed, I can create issues for these

Special notes for your reviewer:

Does this PR introduce a user-facing change?

no

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

n/a

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[k8s-ci-robot]

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: jonkerj
Once this PR has been reviewed and has the lgtm label, please assign omerap12 for approval. For more information see the Code Review Process.

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Needs approval from an approver in each of these files:

• vertical-pod-autoscaler/charts/vertical-pod-autoscaler/OWNERS

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