test: skip backups test in samples

Author: alkatrivedi

samples/system-test/spanner.test.js

@@ -92,6 +92,8 @@ const KEY_RING_ID = 'test-key-ring-node';
 const KEY_ID = 'test-key';
 const DEFAULT_LEADER = 'us-central1';
 const DEFAULT_LEADER_2 = 'us-east1';
+const SKIP_BACKUPS = process.env.SKIP_BACKUPS;
+const KOKORO_JOB_NAME = process.env.KOKORO_JOB_NAME;
 
 const spanner = new Spanner({
   projectId: PROJECT_ID,
@@ -2427,6 +2429,12 @@ describe('Autogenerated Admin Clients', () => {
     let instance_already_exists = false;
     let key1, key2, key3;
     before(async () => {
+      if (
+        SKIP_BACKUPS === 'true' ||
+        (KOKORO_JOB_NAME && KOKORO_JOB_NAME.includes('presubmit'))
+      ) {
+        this.skip();
+      }
       // Create multiple KMS keys covering `nam3`.
       key1 = await getCryptoKey(KEY_LOCATION_ID1);
       key2 = await getCryptoKey(KEY_LOCATION_ID2);