Add OpenShift CA bundle when deployed on OpenShift

[joelsmith]

Also, fix namespace for prometheus monitoring objects

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[zroubalik]

This is not the correct fix, we shouldn't have merged this one. The KEDA generated secrets clashes with the OpenShift provided ones, see the log:

2023-05-26T18:12:51Z    ERROR   cert-rotation   Error updating webhook with certificate {"name": "v1beta1.external.metrics.k8s.io", "gvk": "apiregistration.k8s.io/v1, Kind=APIService", "error": "Operation cannot be fulfilled on apiservices.apiregistration.k8s.io \"v1beta1.external.metrics.k8s.io\": the object has been modified; please apply your changes to the latest version and try again"}
github.com/open-policy-agent/cert-controller/pkg/rotator.(*ReconcileWH).ensureCerts
    /workspace/vendor/github.com/open-policy-agent/cert-controller/pkg/rotator/rotator.go:750
github.com/open-policy-agent/cert-controller/pkg/rotator.(*ReconcileWH).Reconcile
    /workspace/vendor/github.com/open-policy-agent/cert-controller/pkg/rotator/rotator.go:700
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).Reconcile
    /workspace/vendor/sigs.k8s.io/controller-runtime/pkg/internal/controller/controller.go:122
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).reconcileHandler
    /workspace/vendor/sigs.k8s.io/controller-runtime/pkg/internal/controller/controller.go:323
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).processNextWorkItem
    /workspace/vendor/sigs.k8s.io/controller-runtime/pkg/internal/controller/controller.go:274
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).Start.func2.2
    /workspace/vendor/sigs.k8s.io/controller-runtime/pkg/internal/controller/controller.go:235
2023-05-26T18:12:51Z    ERROR   Reconciler error    {"controller": "cert-rotator", "object": {"name":"kedaorg-certs","namespace":"keda"}, "namespace": "keda", "name": "kedaorg-certs", "reconcileID": "af8ab95a-8f65-412c-8213-8738b1ce951e", "error": "Operation cannot be fulfilled on apiservices.apiregistration.k8s.io \"v1beta1.external.metrics.k8s.io\": the object has been modified; please apply your changes to the latest version and try again"}
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).reconcileHandler
    /workspace/vendor/sigs.k8s.io/controller-runtime/pkg/internal/controller/controller.go:329
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).processNextWorkItem
    /workspace/vendor/sigs.k8s.io/controller-runtime/pkg/internal/controller/controller.go:274
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).Start.func2.2
    /workspace/vendor/sigs.k8s.io/controller-runtime/pkg/internal/controller/controller.go:235
2023-05-26T18:12:51Z    INFO    cert-rotation   Ensuring CA cert    {"name": "keda-admission", "gvk": "admissionregistration.k8s.io/v1, Kind=ValidatingWebhookConfiguration", "name": "keda-admission", "gvk": "admissionregistration.k8s.io/v1, Kind=ValidatingWebhookConfiguration"}
2023-05-26T18:12:51Z    INFO    cert-rotation   Ensuring CA cert    {"name": "v1beta1.external.metrics.k8s.io", "gvk": "apiregistration.k8s.io/v1, Kind=APIService", "name": "v1beta1.external.metrics.k8s.io", "gvk": "apiregistration.k8s.io/v1, Kind=APIService"}
2023-05-26T18:12:51Z    INFO    cert-rotation   Ensuring CA cert    {"name": "keda-admission", "gvk": "admissionregistration.k8s.io/v1, Kind=ValidatingWebhookConfiguration", "name": "keda-admission", "gvk": "admissionregistration.k8s.io/v1, Kind=ValidatingWebhookConfiguration"}
2023-05-26T18:12:51Z    INFO    cert-rotation   Ensuring CA cert    {"name": "v1beta1.external.metrics.k8s.io", "gvk": "apiregistration.k8s.io/v1, Kind=APIService", "name": "v1beta1.external.metrics.k8s.io", "gvk": "apiregistration.k8s.io/v1, Kind=APIService"}
2023-05-26T18:12:51Z    INFO    cert-rotation   Ensuring CA cert    {"name": "keda-admission", "gvk": "admissionregistration.k8s.io/v1, Kind=ValidatingWebhookConfiguration", "name": "keda-admission", "gvk": "admissionregistration.k8s.io/v1, Kind=ValidatingWebhookConfiguration"}
2023-05-26T18:12:51Z    INFO    cert-rotation   Ensuring CA cert    {"name": "v1beta1.external.metrics.k8s.io", "gvk": "apiregistration.k8s.io/v1, Kind=APIService", "name": "v1beta1.external.metrics.k8s.io", "gvk": "apiregistration.k8s.io/v1, Kind=APIService"}
2023-05-26T18:12:51Z    INFO    cert-rotation   Ensuring CA cert    {"name": "keda-admission", "gvk": "admissionregistration.k8s.io/v1, Kind=ValidatingWebhookConfiguration", "name": "keda-admission", "gvk": "admissionregistration.k8s.io/v1, Kind=ValidatingWebhookConfiguration"}
2023-05-26T18:12:51Z    INFO    cert-rotation   Ensuring CA cert    {"name": "v1beta1.external.metrics.k8s.io", "gvk": "apiregistration.k8s.io/v1, Kind=APIService", "name": "v1beta1.external.metrics.k8s.io", "gvk": "apiregistration.k8s.io/v1, Kind=APIService"}

[joelsmith]

@zroubalik sorry about that. I merged this thinking it was a step in the right direction. I will work on a follow-up PR to fix the conflict, or if you prefer, I can revert this change. I believe (but am not certain) that the errors you mentioned are not related to my change and were already there from the 2.10.1 rebase. If I am not mistaken, this change is separate and only allows TLS connections to in-cluster metrics sources like Prometheus.