Remove orphaned Policy and PlacementBinding references

[MarianMacik]

Description

Follow-up to the #229 which contained some unused references to Policy and PlacementBinding. Unfortunately kustomize doesn't fail for test patch operation if a resource doesn't exist as can be seen in kubernetes-sigs/kustomize/issues/4379.

How Has This Been Tested?

Ran kustomize before and after, there was no difference in the output, which means the removed parts were not applied.

Merge criteria:

• [x] The commits are squashed in a cohesive manner and have meaningful messages.
• [x] Testing instructions have been added in the PR body (for PRs involving changes that are not immediately obvious).
• [x] The developer has manually tested the changes and verified that the changes work

[openshift-ci[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: grdryn, MarianMacik

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