chore: fix npm for Node v18 samples tests (#2557)

* chore: fix `npm` for Node v18 samples tests

chore: fix `npm` for samples tests

Source-Link: googleapis/synthtool@4d75242
Post-Processor: gcr.io/cloud-devrel-public-resources/owlbot-nodejs:latest@sha256:0d39e59663287ae929c1d4ccf8ebf7cef9946826c9b86eda7e85d8d752dbb584

* re-add deleted env var

* ignore samples-test.sh

---------

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>
Co-authored-by: Denis DelGrosso <85250797+ddelgrosso1@users.noreply.github.com>
Co-authored-by: Denis DelGrosso <ddelgrosso@google.com>

Author: gcf-owl-bot[bot]

.github/.OwlBot.lock.yaml

@@ -13,5 +13,6 @@
 # limitations under the License.
 docker:
   image: gcr.io/cloud-devrel-public-resources/owlbot-nodejs:latest
-  digest: sha256:22e41dd7cd82683fa338b647abcc3a29ddb1b17e800b089adc0bec0a3175312c
-# created: 2024-10-30T16:51:59.982020867Z
+  digest: sha256:0d39e59663287ae929c1d4ccf8ebf7cef9946826c9b86eda7e85d8d752dbb584
+# created: 2024-11-21T22:39:44.342569463Z
+

.github/workflows/ci.yaml

@@ -46,4 +46,4 @@ jobs:
           node-version: 18
       - run: npm install
       - run: npm run lint
-
+      

.kokoro/samples-test.sh

@@ -30,7 +30,8 @@
                             '.kokoro/continuous/node14/system-test.cfg',
                             '.kokoro/presubmit/node14/system-test.cfg',
                             '.kokoro/release/publish.cfg',
-                            '.kokoro/system-test.sh'
+                            '.kokoro/system-test.sh',
+                            '.kokoro/samples-test.sh',
                             ])
 
 # Create .config directory under $HOME to get around permissions issues