scripts: add ignore-not-found for undeploy and uninstall to Makefile boiler plate

[sgaist]

Description of the change:

This PR adds the --ignore-not-found parameter to the kubectl call when calling make undeploy and make uninstall.

Motivation for the change:

This avoid the failure of either command if for some reason one or more of the kustomized resource is missing.

Part of #5195

Checklist

If the pull request includes user-facing changes, extra documentation is required:

• Add a new changelog fragment in changelog/fragments (see changelog/fragments/00-template.yaml)
• Add or update relevant sections of the docs website in website/content/en/docs

[openshift-bot]

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/lifecycle stale

[openshift-bot]

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/lifecycle rotten
/remove-lifecycle stale

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[openshift-ci]

@openshift-bot: Closed this PR.

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Rotten issues close after 30d of inactivity.

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[sgaist]

/reopen

[openshift-ci]

@sgaist: Reopened this PR.

In response to this:

/reopen

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