Upgrade operator-sdk to v1.40.0 and remove kube-rbac-proxy

Bump operator-sdk, ansible-operator, and OPM binaries to align with
the OCP 4.20 / AAP 2.7 target. Replace the deprecated kube-rbac-proxy
sidecar (removed in operator-sdk v1.38.0) with controller-runtime's
built-in WithAuthenticationAndAuthorization for metrics endpoint
protection.

Changes:
- Makefile: operator-sdk v1.36.1 → v1.40.0, OPM v1.26.0 → v1.55.0
- Dockerfile: ansible-operator base image v1.36.1 → v1.40.0
- Remove kube-rbac-proxy sidecar and auth_proxy_* RBAC manifests
- Add metrics_auth_role, metrics_reader, and metrics_service resources
- Add --metrics-secure, --metrics-require-rbac, --metrics-bind-address
  flags via JSON patch to serve metrics directly from the manager on
  port 8443 with TLS and RBAC authentication

Ref: AAP-65254

Authored By: Christian M. Adams <chadams@redhat.com>
Assisted By: Claude

config/default/manager_metrics_patch.yaml

@@ -0,0 +1,12 @@
+# This patch adds the args to allow exposing the metrics endpoint using HTTPS
+- op: add
+  path: /spec/template/spec/containers/0/args/0
+  value: --metrics-bind-address=:8443
+# This patch adds the args to allow securing the metrics endpoint
+- op: add
+  path: /spec/template/spec/containers/0/args/0
+  value: --metrics-secure
+# This patch adds the args to allow RBAC-based authn/authz for the metrics endpoint
+- op: add
+  path: /spec/template/spec/containers/0/args/0
+  value: --metrics-require-rbac