metrics: Add permissions to remove monitor objects

When the `metricsExporter` feature is turned off, deployed resources
should be removed. These changes fix the error:

```
│ 2024-08-28T14:07:57.699760017Z    ERROR    controller/controller.go:266    Reconciler error    {"controller": "sriovoperatorconfig", "controllerGroup": "sriovnetwork.openshift.io", "controllerKind": "SriovOperatorConfig", "SriovOperatorConfig": {"name":"default","namespace":"openshift-sriov-network-operator"},  │
│ "namespace": "openshift-sriov-network-operator", "name": "default", "reconcileID": "fa841c50-dbb8-4c4c-9ddd-b98624fd2a24", "error": "failed to delete object &{map[apiVersion:monitoring.coreos.com/v1 kind:ServiceMonitor metadata:map[name:sriov-network-metrics-exporter namespace:openshift-sriov-network-operator]  │
│ spec:map[endpoints:[map[bearerTokenFile:/var/run/secrets/kubernetes.io/serviceaccount/token honorLabels:true interval:30s port:sriov-network-metrics scheme:https tlsConfig:map[caFile:/etc/prometheus/configmaps/serving-certs-ca-bundle/service-ca.crt insecureSkipVerify:false serverName:sriov-network-metrics-expor │
│ ter-service.openshift-sriov-network-operator.svc]]] namespaceSelector:map[matchNames:[openshift-sriov-network-operator]] selector:map[matchLabels:map[name:sriov-network-metrics-exporter-service]]]]} with err: could not delete object (monitoring.coreos.com/v1, Kind=ServiceMonitor) openshift-sriov-network-operato │
│ r/sriov-network-metrics-exporter: servicemonitors.monitoring.coreos.com \"sriov-network-metrics-exporter\" is forbidden: User \"system:serviceaccount:openshift-sriov-network-operator:sriov-network-operator\" cannot delete resource \"servicemonitors\" in API group \"monitoring.coreos.com\" in the namespace \"ope │
│ nshift-sriov-network-operator\""}
```

Signed-off-by: Andrea Panattoni <apanatto@redhat.com>

deploy/role.yaml

@@ -32,6 +32,8 @@ rules:
   verbs:
   - get
   - create
+  - update
+  - delete
 - apiGroups:
   - apps
   resourceNames:

deployment/sriov-network-operator-chart/templates/role.yaml

@@ -35,6 +35,8 @@ rules:
     verbs:
       - get
       - create
+      - update
+      - delete
   - apiGroups:
       - apps
     resourceNames:

test/conformance/tests/test_sriov_operator.go

@@ -311,6 +311,14 @@ var _ = Describe("[sriov] operator", func() {
 					g.Expect(err).ToNot(HaveOccurred())
 				}).Should(Succeed())
 			})
+
+			It("should remove ServiceMonitor when the feature is turned off", func() {
+				setFeatureFlag("metricsExporter", false)
+				Eventually(func(g Gomega) {
+					_, err := clients.ServiceMonitors(operatorNamespace).Get(context.Background(), "sriov-network-metrics-exporter", metav1.GetOptions{})
+					g.Expect(k8serrors.IsNotFound(err)).To(BeTrue())
+				}).Should(Succeed())
+			})
 		})
 	})