Helm Chart should support PDB with Keda

[lancehudson]

When enabling Keda autoscalling, a PDB should still be created

This resource only supports the HPA config. It should be updated to support Keda as well (or duplicated)
https://github.com/kubernetes/ingress-nginx/blob/main/charts/ingress-nginx/templates/controller-poddisruptionbudget.yaml#L1

other:
https://github.com/kubernetes/ingress-nginx/blob/main/charts/ingress-nginx/templates/controller-keda.yaml#L1

[strongjz]

/good-first-issue
/help-wanted
/triage accepted
/priority backlog

[k8s-ci-robot]

@strongjz:
This request has been marked as suitable for new contributors.

Guidelines

Please ensure that the issue body includes answers to the following questions:

• Why are we solving this issue?
• To address this issue, are there any code changes? If there are code changes, what needs to be done in the code and what places can the assignee treat as reference points?
• Does this issue have zero to low barrier of entry?
• How can the assignee reach out to you for help?

For more details on the requirements of such an issue, please see here and ensure that they are met.

If this request no longer meets these requirements, the label can be removed
by commenting with the /remove-good-first-issue command.

In response to this:

/good-first-issue
/help-wanted
/triage accepted
/priority backlog

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[github-actions]

This is stale, but we won't close it automatically, just bare in mind the maintainers may be busy with other tasks and will reach your issue ASAP. If you have any question or request to prioritize this, please reach #ingress-nginx-dev on Kubernetes Slack.