feat: enable watch-referenced-objects-in-all-namespaces in Prometheus operator (#945)

This commit enables the `--watch-referenced-objects-in-all-namespaces`
flag in the Prometheus operator deployment to ensure that the operator
reconciles configurations when a secret/configmap referenced by a
custom resource gets an update.

Upstream issue:
https://github.com/prometheus-operator/prometheus-operator/issue/6018

Signed-off-by: Simon Pasquier <[email protected]>

Author: simonpasquier

bundle/manifests/observability-operator.clusterserviceversion.yaml

@@ -42,7 +42,7 @@ metadata:
     categories: Monitoring
     certified: "false"
     containerImage: observability-operator:1.3.0
-    createdAt: "2025-11-26T07:19:50Z"
+    createdAt: "2025-11-27T18:47:09Z"
     description: A Go based Kubernetes operator to setup and manage highly available
       Monitoring Stack using Prometheus, Alertmanager and Thanos Querier.
     operatorframework.io/cluster-monitoring: "true"
@@ -864,6 +864,7 @@ spec:
                 - --prometheus-instance-selector=app.kubernetes.io/managed-by=observability-operator
                 - --alertmanager-instance-selector=app.kubernetes.io/managed-by=observability-operator
                 - --thanos-ruler-instance-selector=app.kubernetes.io/managed-by=observability-operator
+                - --watch-referenced-objects-in-all-namespaces=true
                 env:
                 - name: GOGC
                   value: "30"

deploy/dependencies/kustomization.yaml

@@ -76,6 +76,7 @@ patches:
                 - --prometheus-instance-selector=app.kubernetes.io/managed-by=observability-operator
                 - --alertmanager-instance-selector=app.kubernetes.io/managed-by=observability-operator
                 - --thanos-ruler-instance-selector=app.kubernetes.io/managed-by=observability-operator
+                - --watch-referenced-objects-in-all-namespaces=true
               resources:
                 requests:
                   cpu: 5m