Make kind-e2e workflow only build images once

Author: carreter

.github/workflows/e2e.yaml

@@ -69,6 +69,12 @@ jobs:
       with:
         go-version-file: go.mod
       id: go
+    - uses: actions/download-artifact@v4
+      with:
+        name: konnectivity-server
+    - uses: actions/download-artifact@v4
+      with:
+        name: konnectivity-agent
     - name: Install kind
       run: |
         curl -Lo ./kind https://kind.sigs.k8s.io/dl/v0.23.0/kind-linux-amd64