fix(tests): use unprivileged nginx image for openshift compatibility

Author: razvan

tests/templates/kuttl/restarter-no-unneeded-restart/01-early-before-config.yaml

@@ -22,7 +22,7 @@ spec:
       terminationGracePeriodSeconds: 10
       containers:
         - name: nginx
-          image: registry.k8s.io/nginx-slim:0.24
+          image: nginxinc/nginx-unprivileged:1.27
           volumeMounts:
             - name: config
               mountPath: "/config"

tests/templates/kuttl/restarter-no-unneeded-restart/02-late-after-config.yaml

@@ -36,7 +36,7 @@ spec:
       terminationGracePeriodSeconds: 10
       containers:
         - name: nginx
-          image: registry.k8s.io/nginx-slim:0.24
+          image: nginxinc/nginx-unprivileged:1.27
           volumeMounts:
             - name: config
               mountPath: "/config"