[skip ci] Echo exported logs information (#6750)

Signed-off-by: quicksilver <zhifeng.zhang@zilliz.com>

build/ci/jenkins/pod/krte.yaml

@@ -18,7 +18,7 @@ spec:
     args: ["cat"]
     resources:
       limits:
-        cpu: "6"
+        cpu: "8"
         memory: 14Gi
         ephemeral-storage: "30Gi"
       requests:

tests/scripts/export_logs.sh

@@ -24,3 +24,5 @@ for node in `kind get nodes --name=kind | tr -s '\n' ' '`
 do
   docker cp $node:/var/log "${ARTIFACTS}/${KIND_NAME}"
 done
+
+echo "Exported logs for cluster \"${KIND_NAME}\" to: \"${ARTIFACTS}/${KIND_NAME}\""