build: move system and samples test from Node 10 to Node 12 (#470)

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Synth log will be available here:
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Source-Link: googleapis/synthtool@05de3e1

packages/google-cloud-videointelligence/synth.metadata

@@ -4,22 +4,22 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/nodejs-video-intelligence.git",
-        "sha": "8691f8873ba0026f7110d29ced7c5a5403de8a10"
+        "sha": "b0f47af3a4ded65fd8829e971421b75b7ffe6ff1"
       }
     },
     {
       "git": {
         "name": "googleapis",
         "remote": "https://github.com/googleapis/googleapis.git",
-        "sha": "4c5071b615d96ef9dfd6a63d8429090f1f2872bb",
-        "internalRef": "327369997"
+        "sha": "fea9b1a2424c3982a4e894f502792e8b21506c1b",
+        "internalRef": "327704565"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "1a60ff2a3975c2f5054431588bd95db9c3b862ba"
+        "sha": "05de3e1e14a0b07eab8b474e669164dbd31f81fb"
       }
     }
   ],
@@ -87,19 +87,19 @@
     ".kokoro/common.cfg",
     ".kokoro/continuous/node10/common.cfg",
     ".kokoro/continuous/node10/docs.cfg",
-    ".kokoro/continuous/node10/lint.cfg",
-    ".kokoro/continuous/node10/samples-test.cfg",
-    ".kokoro/continuous/node10/system-test.cfg",
     ".kokoro/continuous/node10/test.cfg",
     ".kokoro/continuous/node12/common.cfg",
+    ".kokoro/continuous/node12/lint.cfg",
+    ".kokoro/continuous/node12/samples-test.cfg",
+    ".kokoro/continuous/node12/system-test.cfg",
     ".kokoro/continuous/node12/test.cfg",
     ".kokoro/docs.sh",
     ".kokoro/lint.sh",
     ".kokoro/populate-secrets.sh",
     ".kokoro/presubmit/node10/common.cfg",
-    ".kokoro/presubmit/node10/samples-test.cfg",
-    ".kokoro/presubmit/node10/system-test.cfg",
     ".kokoro/presubmit/node12/common.cfg",
+    ".kokoro/presubmit/node12/samples-test.cfg",
+    ".kokoro/presubmit/node12/system-test.cfg",
     ".kokoro/presubmit/node12/test.cfg",
     ".kokoro/publish.sh",
     ".kokoro/release/docs-devsite.cfg",
@@ -122,7 +122,6 @@
     "README.md",
     "api-extractor.json",
     "linkinator.config.json",
-    "package-lock.json.2422662572",
     "protos/google/cloud/videointelligence/v1/video_intelligence.proto",
     "protos/google/cloud/videointelligence/v1beta2/video_intelligence.proto",
     "protos/google/cloud/videointelligence/v1p1beta1/video_intelligence.proto",
@@ -133,7 +132,6 @@
     "protos/protos.json",
     "renovate.json",
     "samples/README.md",
-    "samples/package-lock.json.2298634620",
     "src/index.ts",
     "src/v1/index.ts",
     "src/v1/video_intelligence_service_client.ts",