ci: fix cilium hubble deployment v1.5 (#3628)

Author: camrynl

.pipelines/cni/cilium/cilium-overlay-load-test-template.yaml

@@ -135,7 +135,7 @@ stages:
 
                   echo "install Cilium onto Overlay Cluster with hubble enabled"
                   export CILIUM_VERSION_TAG_V1_5=${CILIUM_HUBBLE_VERSION_TAG}
-                  export DIR=${CILIUM_VERSION_TAG_V1_5%.*}
+                  export DIR=$(echo ${CILIUM_VERSION_TAG_V1_5#v} | cut -d. -f1,2)
                   echo "installing files from ${DIR}"
                   kubectl apply -f test/integration/manifests/cilium/v${DIR}/cilium-config/cilium-config-hubble.yaml
                   kubectl apply -f test/integration/manifests/cilium/v${DIR}/cilium-agent/files