Fix setting manifest configurations

[dhaiducek]

• Fix severity set at the manifest level
• Fix setting manifest overrides correctly
  • Since the manifest configuration wasn't being set when consolidateManifests was true, it wasn't being propagated to things like expanded policies and policy template manifests provided directly. This fixes it to set manifest configurations and then compare manifest and policy configurations to make sure they match when consolidateManifests is true.

ref: https://issues.redhat.com/browse/ACM-9131

[dhaiducek]

Didn't account for Placement changes in main. Updating.

[dhaiducek]

/cherry-pick v1.12

[openshift-cherrypick-robot]

@dhaiducek: once the present PR merges, I will cherry-pick it on top of v1.12 in a new PR and assign it to you.

In response to [this](https://github.com/open-cluster-management-io/policy-generator-plugin/pull/137#issuecomment-1861421648): >/cherry-pick v1.12 Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes/test-infra](https://github.com/kubernetes/test-infra/issues/new?title=Prow%20issue:) repository.

[openshift-ci[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dhaiducek, mprahl

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/open-cluster-management-io/policy-generator-plugin/blob/main/OWNERS)~~ [dhaiducek,mprahl] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[openshift-cherrypick-robot]

@dhaiducek: new pull request created: #138

In response to [this](https://github.com/open-cluster-management-io/policy-generator-plugin/pull/137#issuecomment-1861421648): >/cherry-pick v1.12 Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes/test-infra](https://github.com/kubernetes/test-infra/issues/new?title=Prow%20issue:) repository.