fix: add vcluster port-forward command to use as the background proxy… (#2872) (#2875)

* fix: add vcluster port-forward command to use as the background proxy process until containerd/containerd#9875 is resolved

* feat: allow setting the background proxy image via environment variable

(cherry picked from commit 74e339e)

# Conflicts:
#	.github/workflows/e2e.yaml
#	pkg/cli/flags/connect/connect.go
#	pkg/cli/flags/create/create.go
#	pkg/constants/cli.go
#	test/framework/framework.go

Author: lizardruss

.github/workflows/e2e.yaml

@@ -217,6 +217,7 @@ jobs:
         run: |
           chmod +x ./vcluster-current
 
+          docker load --input vcluster_syncer
           kind load image-archive vcluster_syncer
           yq eval '.controlPlane.distro.${{ matrix.distribution }}.enabled = true' > ./test/vcluster-current.yaml
 
@@ -357,6 +358,7 @@ jobs:
           sed -i "s|REPLACE_TAG_NAME|${{ env.TAG_NAME }}|g" ${{ matrix.test-suite-path }}/../commonValues.yaml
           yq eval -i '.controlPlane.distro.${{ matrix.distribution }}.enabled = true'  ${{ matrix.test-suite-path }}/../commonValues.yaml
 
+          docker load --input vcluster_syncer
           kind load image-archive vcluster_syncer
 
           chmod +x vcluster && sudo mv vcluster /usr/bin
@@ -409,6 +411,7 @@ jobs:
           VCLUSTER_SUFFIX=${{ env.VCLUSTER_SUFFIX }} \
           VCLUSTER_NAME=${{ env.VCLUSTER_NAME }} \
           VCLUSTER_NAMESPACE=${{ env.VCLUSTER_NAMESPACE }} \
+          VCLUSTER_BACKGROUND_PROXY_IMAGE=${{ env.REPOSITORY_NAME }}:${{ env.TAG_NAME }} \
           MULTINAMESPACE_MODE=${{ matrix.multinamespace-mode }} \
           go test -timeout 40m -mod=vendor -test.v --ginkgo.v --ginkgo.skip='.*NetworkPolicy.*' --ginkgo.fail-fast ${{ matrix.test-suite-path }}
           if kubectl logs -l app=${{ env.VCLUSTER_SUFFIX }} -n ${{ env.VCLUSTER_NAMESPACE }} -c syncer --tail=-1 -p >/dev/null 2>/dev/null; then