Description of problem:
A change [1] was introduced to split the kube-apiserver SLO rules into 2 groups to reduce the load on Prometheus (see bug 2004585). 

[1] https://github.com/openshift/cluster-kube-apiserver-operator/commit/4a1751ee86cda37f0d9ea520cac09f91ebc3abe9

Version-Release number of selected component (if applicable):
4.9 (because the change was backported to 4.9.z)

How reproducible:
Always

Steps to Reproduce:
1. Install OCP 4.9
2. Retrieve kube-apiserver-slos* 
oc get -n openshift-kube-apiserver prometheusrules kube-apiserver-slos -o yaml
oc get -n openshift-kube-apiserver prometheusrules kube-apiserver-slos-basic -o yaml

Actual results:

The KubeAPIErrorBudgetBurn alert with labels {long="1h",namespace="openshift-kube-apiserver",severity="critical",short="5m"} exists both in kube-apiserver-slos and kube-apiserver-slos-basic.

The alerting rules is evaluated twice. The same is true for recording rules like "apiserver_request:burnrate1h" and in this case, it can trigger warning logs in the Prometheus pods:

> level=warn component="rule manager" group=kube-apiserver.rules msg="Error on ingesting out-of-order result from rule evaluation" numDropped=283


Expected results:

I presume that kube-apiserver-slos shouldn't exist since it's been replaced by kube-apiserver-slos-basic and kube-apiserver-slos-extended.

Additional info:

Discovered while investigating bug 2091902