chart: add support for controller pod disruption budget

[mf-lit]

Is this a bug fix or adding new feature?

Feature

What is this PR about? / Why do we need it?

Adds an optional pod disruption budget for the controller, disabled by default

What testing is done?

helm template and helm upgrade

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[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: mf-lit
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PR needs rebase.

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/lifecycle stale

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/lifecycle rotten

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/close

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@k8s-triage-robot: Closed this PR.

In response to this:

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This bot triages PRs according to the following rules:

• After 90d of inactivity, lifecycle/stale is applied
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/close

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