Update Cilium air-gap images to v1.15.0

Also provides an update for:
- cilium-envoy v1.27.2-13f6142b9c02268b10d547c8b093ef16724538e3
- hubble-ui v.12.3
- hardened-cni-plugins v1.4.0-build20240122

Signed-off-by: Michael Fritch <[email protected]>
(cherry picked from commit f4e1cb4)

scripts/build-images

@@ -36,17 +36,16 @@ EOF
 if [ "${GOARCH}" != "s390x" ]; then
 xargs -n1 -t docker image pull --quiet << EOF > build/images-cilium.txt
     ${REGISTRY}/rancher/mirrored-cilium-certgen:v0.1.9
-    ${REGISTRY}/rancher/mirrored-cilium-cilium:v1.14.4
-    ${REGISTRY}/rancher/mirrored-cilium-cilium-envoy:v1.26.6-ff0d5d3f77d610040e93c7c7a430d61a0c0b90c1
-    ${REGISTRY}/rancher/mirrored-cilium-clustermesh-apiserver:v1.14.4
-    ${REGISTRY}/rancher/mirrored-cilium-hubble-relay:v1.14.4
-    ${REGISTRY}/rancher/mirrored-cilium-hubble-ui:v0.12.1
-    ${REGISTRY}/rancher/mirrored-cilium-hubble-ui-backend:v0.12.1
-    ${REGISTRY}/rancher/mirrored-cilium-kvstoremesh:v1.14.4
-    ${REGISTRY}/rancher/mirrored-cilium-operator-aws:v1.14.4
-    ${REGISTRY}/rancher/mirrored-cilium-operator-azure:v1.14.4
-    ${REGISTRY}/rancher/mirrored-cilium-operator-generic:v1.14.4
-    ${REGISTRY}/rancher/hardened-cni-plugins:v1.2.0-build20231009
+    ${REGISTRY}/rancher/mirrored-cilium-cilium:v1.15.0
+    ${REGISTRY}/rancher/mirrored-cilium-cilium-envoy:v1.27.2-13f6142b9c02268b10d547c8b093ef16724538e3
+    ${REGISTRY}/rancher/mirrored-cilium-clustermesh-apiserver:v1.15.0
+    ${REGISTRY}/rancher/mirrored-cilium-hubble-relay:v1.15.0
+    ${REGISTRY}/rancher/mirrored-cilium-hubble-ui:v0.12.3
+    ${REGISTRY}/rancher/mirrored-cilium-hubble-ui-backend:v0.12.3
+    ${REGISTRY}/rancher/mirrored-cilium-operator-aws:v1.15.0
+    ${REGISTRY}/rancher/mirrored-cilium-operator-azure:v1.15.0
+    ${REGISTRY}/rancher/mirrored-cilium-operator-generic:v1.15.0
+    ${REGISTRY}/rancher/hardened-cni-plugins:v1.4.0-build20240122
 EOF
 
 xargs -n1 -t docker image pull --quiet << EOF > build/images-calico.txt