feat(chart): support configuring dnsConfig

[sslavic]

What type of PR is this?

/kind feature

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #8060

Special notes for your reviewer:

PR extends cluster-autoscaler Helm chart with support for configuring dnsConfig.

PR was tested manually with helm template:

• backward compatibility preserved, there are no template changes with default values
• when dnsConfig is provided, it gets set for the Deployment Pod template spec

Does this PR introduce a user-facing change?

Supports configuring `dnsConfig`

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

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: sslavic
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