chore: Add kokoro job to run system tests on Node 24

PiperOrigin-RevId: 895939565

Author: sararob

.kokoro/presubmit/node24/common.cfg

@@ -0,0 +1,19 @@
+# Format: //devtools/kokoro/config/proto/build.proto
+
+# Build logs will be here
+action {
+  define_artifacts {
+    regex: "**/*sponge_log.xml"
+  }
+}
+
+# Download trampoline resources.
+gfile_resources: "/bigstore/cloud-devrel-kokoro-resources/trampoline"
+
+# Use the trampoline script to run in docker.
+build_file: "nodejs-vertexai/.kokoro/trampoline_v2.sh"
+
+env_vars: {
+    key: "TRAMPOLINE_IMAGE"
+    value: "us-central1-docker.pkg.dev/genai-sdk-kokoro-gcp/genai-sdk-js-kokoro/genai-sdk-js-kokoro-presubmit:latest"
+}

.kokoro/presubmit/node24/system-test.cfg

@@ -0,0 +1,12 @@
+# Download resources for system tests (service account key, etc.)
+gfile_resources: "/bigstore/cloud-devrel-kokoro-resources/google-cloud-nodejs"
+
+env_vars: {
+    key: "TRAMPOLINE_BUILD_FILE"
+    value: "github/nodejs-vertexai/.kokoro/system-test.sh"
+}
+
+env_vars: {
+    key: "SECRET_MANAGER_KEYS"
+    value: ""
+}