Avoid injecting the owner for all cluster scoped resources based on 0.7.2 Manifestival

[houshengbo]

0.7.2 Manifestival introduced the following error message.

{"severity":"ERROR","timestamp":"2023-07-28T16:55:17.698740051Z","logger":"knative-operator.manifestival","caller":"manifestival@v0.7.2/manifestival.go:165","message":"Failed to update merged resource, trying overwrite","commit":"c92298f-dirty","knative.dev/pod":"knative-operator-54f7867d59-qp95q","error":"ValidatingWebhookConfiguration.admissionregistration.k8s.io \"validation.inmemorychannel.eventing.knative.dev\" is invalid: metadata.ownerReferences: Invalid value: []v1.OwnerReference{v1.OwnerReference{APIVersion:\"operator.knative.dev/v1beta1\", Kind:\"KnativeEventing\", Name:\"knative-eventing\", UID:\"8db6724e-a45b-4e2c-9688-9d739db84021\", Controller:(*bool)(0x401946ce75), BlockOwnerDeletion:(*bool)(0x401946ce76)}, v1.OwnerReference{APIVersion:\"v1\", Kind:\"Namespace\", Name:\"eventing-test\", UID:\"e7badf16-0cc4-4638-b24f-5950827e9da5\", Controller:(*bool)(0x401946ce77), BlockOwnerDeletion:(*bool)(0x401946ce78)}}: Only one reference can have Controller set to true. Found \"true\" in references for KnativeEventing/knative-eventing and Namespace/eventing-test","stacktrace":"github.com/manifestival/manifestival.Manifest.update\n\tgithub.com/manifestival/manifestival@v0.7.2/manifestival.go:165\ngithub.com/manifestival/manifestival.Manifest.apply\n\tgithub.com/manifestival/manifestival@v0.7.2/manifestival.go:155\ngithub.com/manifestival/manifestival.Manifest.Apply\n\tgithub.com/manifestival/manifestival@v0.7.2/manifestival.go:100\nknative.dev/operator/pkg/reconciler/common.Install\n\tknative.dev/operator/pkg/reconciler/common/install.go:65\nknative.dev/operator/pkg/reconciler/manifests.Install\n\tknative.dev/operator/pkg/reconciler/manifests/install.go:33\nknative.dev/operator/pkg/reconciler/common.Stages.Execute\n\tknative.dev/operator/pkg/reconciler/common/stages.go:36\nknative.dev/operator/pkg/reconciler/knativeeventing.(*Reconciler).ReconcileKind\n\tknative.dev/operator/pkg/reconciler/knativeeventing/knativeeventing.go:128\nknative.dev/operator/pkg/client/injection/reconciler/operator/v1beta1/knativeeventing.(*reconcilerImpl).Reconcile\n\tknative.dev/operator/pkg/client/injection/reconciler/operator/v1beta1/knativeeventing/reconciler.go:236\nknative.dev/pkg/controller.(*Impl).processNextWorkItem\n\tknative.dev/pkg@v0.0.0-20230727013143-aa56e29007bb/controller/controller.go:542\nknative.dev/pkg/controller.(*Impl).RunContext.func3\n\tknative.dev/pkg@v0.0.0-20230727013143-aa56e29007bb/controller/controller.go:491"}

We need the lib Manifestival 0.7.2 to resolve the issue of nil pointer when deleting a non-existent resources, but we need to add a logic to validate whether it is a cluster scoped resource before injecting the owner.