simplify kube-ovn e2e

Author: zhangzujian

.github/workflows/build-x86-image.yaml

@@ -523,9 +523,6 @@ jobs:
           - ipv4
           - ipv6
           - dual
-        mode:
-          - overlay
-          - underlay
     steps:
       - uses: actions/checkout@v3
 
@@ -590,14 +587,13 @@ jobs:
           sudo chown -R $(id -un). ~/.kube/
 
       - name: Install Kube-OVN
-        run: make kind-install-${{ matrix.mode }}-${{ matrix.ip-family }}
+        run: make kind-install-${{ matrix.ip-family }}
 
       - name: Run E2E
         working-directory: ${{ env.E2E_DIR }}
         env:
           E2E_BRANCH: ${{ github.base_ref || github.ref_name }}
           E2E_IP_FAMILY: ${{ matrix.ip-family }}
-          E2E_NETWORK_MODE: ${{ matrix.mode }}
         run: make kube-ovn-conformance-e2e
 
       - name: Cleanup