chore: Configure system tests to run in Node 22

PiperOrigin-RevId: 899084309

Author: sararob

.kokoro/presubmit/node24/common.cfg .kokoro/presubmit/node22/common.cfg.kokoro/presubmit/node24/common.cfg renamed to .kokoro/presubmit/node22/common.cfg

@@ -13,7 +13,12 @@ gfile_resources: "/bigstore/cloud-devrel-kokoro-resources/trampoline"
 # Use the trampoline script to run in docker.
 build_file: "nodejs-vertexai/.kokoro/trampoline_v2.sh"
 
+# Configure the docker image for kokoro-trampoline.
 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"
+    value: "gcr.io/cloud-devrel-kokoro-resources/node:22-user"
+}
+env_vars: {
+    key: "TRAMPOLINE_BUILD_FILE"
+    value: "github/nodejs-vertexai/.kokoro/test.sh"
 }

.kokoro/presubmit/node24/system-test.cfg .kokoro/presubmit/node22/system-test.cfg.kokoro/presubmit/node24/system-test.cfg renamed to .kokoro/presubmit/node22/system-test.cfg

@@ -5,8 +5,3 @@ env_vars: {
     key: "TRAMPOLINE_BUILD_FILE"
     value: "github/nodejs-vertexai/.kokoro/system-test.sh"
 }
-
-env_vars: {
-    key: "SECRET_MANAGER_KEYS"
-    value: ""
-}