fix: fix DataPlane only kustomize for installing CRD

[pmalek]

What this PR does / why we need it:

Fix DataPlane only kustomize for installing CRD which was introduced in #69

k kustomize https://github.com/kong/gateway-operator/config/crd/dataplane/
error: accumulating resources: accumulation err='accumulating resources from '../bases/gateway-operator.konghq.com_dataplanes.yaml': security; file '/private/var/folders/0m/_63w01516tgf3cftmp9h7ylm0000gn/T/kustomize-5188523/config/crd/bases/gateway-operator.konghq.com_dataplanes.yaml' is not in or below '/private/var/folders/0m/_63w01516tgf3cftmp9h7ylm0000gn/T/kustomize-5188523/config/crd/dataplane'': must build at directory: '/private/var/folders/0m/_63w01516tgf3cftmp9h7ylm0000gn/T/kustomize-5188523/config/crd/bases/gateway-operator.konghq.com_dataplanes.yaml': file is not directory

This introduces a copy paste of DataPlane CRD but there's no easy workaround for this given that kustomize requires bases to nested below the kustomization.

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This will allow users to migrate from pre 1.2 versions and avoid errors like this: (logs from flux kustomize controller)

{"level":"error","ts":"2024-05-07T11:40:13.581Z","msg":"Reconciliation failed after 953.354003ms, next try in 5s","controller":"kustomization","controllerGroup":"kustomize.toolkit.fluxcd.io","controllerKind":"Kustomization","Kustomization":{"name":"gateway-operator-crd","namespace":"fluxcd"},"namespace":"fluxcd","name":"gateway-operator-crd","reconcileID":"d83732d7-2d00-4477-94a3-1100187afda6","revision":"v1.2.3@sha1:8f2e8d0efc091efc2a8558093ce0bf92a4968479","error":"CustomResourceDefinition/controlplanes.gateway-operator.konghq.com dry-run failed (Invalid): CustomResourceDefinition.apiextensions.k8s.io \"controlplanes.gateway-operator.konghq.com\" is invalid: status.storedVersions[0]: Invalid value: \"v1alpha1\": must appear in spec.versions"}

CustomResourceDefinition/controlplanes.gateway-operator.konghq.com dry-run failed (Invalid): CustomResourceDefinition.apiextensions.k8s.io \"controlplanes.gateway-operator.konghq.com\" is invalid: status.storedVersions[0]: Invalid value: \"v1alpha1\": must appear in spec.versions