chore: referencing the setup-kind script in the plumbing repo instead of copying it

Signed-off-by: Shubham Bhardwaj <shubbhar@redhat.com>

Author: infernus01

.github/workflows/e2e-matrix.yml

@@ -18,14 +18,14 @@ jobs:
       fail-fast: false # Keep running if one leg fails.
       matrix:
         k8s-name:
-        - k8s-oldest
-        - k8s-plus-one
+          - k8s-oldest
+          - k8s-plus-one
 
         include:
-        - k8s-name: k8s-oldest
-          k8s-version: v1.28.x
-        - k8s-name: k8s-plus-one
-          k8s-version: v1.29.x
+          - k8s-name: k8s-oldest
+            k8s-version: v1.28.x
+          - k8s-name: k8s-plus-one
+            k8s-version: v1.29.x
     env:
       KO_DOCKER_REPO: registry.local:5000/tekton
       CLUSTER_DOMAIN: c${{ github.run_id }}.local
@@ -44,16 +44,16 @@ jobs:
         echo '::group:: install go-junit-report'
         go install github.com/jstemmer/go-junit-report@v0.9.1
         echo '::endgroup::'
-
         echo '::group:: created required folders'
         mkdir -p "${ARTIFACTS}"
         echo '::endgroup::'
-
         echo "${GOPATH}/bin" >> "$GITHUB_PATH"
 
     - name: Run tests
       run: |
-        ./hack/setup-kind.sh \
+        curl -sSfL https://raw.githubusercontent.com/tektoncd/plumbing/main/tekton/images/kind-e2e/setup-kind.sh -o setup-kind.sh
+        chmod +x setup-kind.sh
+        ./setup-kind.sh \
           --registry-url $(echo ${KO_DOCKER_REPO} | cut -d'/' -f 1) \
           --cluster-suffix c${{ github.run_id }}.local \
           --nodes 3 \