build(node_library): migrate to Trampoline V2 (#688)

This PR was generated using Autosynth. 🌈

Synth log will be available here:
https://source.cloud.google.com/results/invocations/939e9a1a-ee83-4100-84cf-4883fa030728/targets

- [ ] To automatically regenerate this PR, check this box.

Source-Link: googleapis/synthtool@0c868d4

Author: yoshi-automation

packages/google-cloud-dialogflow/synth.metadata

@@ -4,7 +4,7 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/nodejs-dialogflow.git",
-        "sha": "484967b7bebeace221c23ce05868a67611f19b32"
+        "sha": "eb4ac4b9a5053a351c5d52c4e21a04c7dbabfb77"
       }
     },
     {
@@ -19,7 +19,7 @@
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "079dcce498117f9570cebe6e6cff254b38ba3860"
+        "sha": "0c868d49b8e05bc1f299bc773df9eb4ef9ed96e9"
       }
     }
   ],
@@ -84,10 +84,12 @@
     ".kokoro/test.bat",
     ".kokoro/test.sh",
     ".kokoro/trampoline.sh",
+    ".kokoro/trampoline_v2.sh",
     ".mocharc.js",
     ".nycrc",
     ".prettierignore",
     ".prettierrc.js",
+    ".trampolinerc",
     "CODE_OF_CONDUCT.md",
     "CONTRIBUTING.md",
     "LICENSE",