build(node_library): migrate to Trampoline V2 (#18)

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Source-Link: googleapis/synthtool@0c868d4

packages/google-cloud-bigquery-reservation/synth.metadata

@@ -4,7 +4,7 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/nodejs-bigquery-reservation.git",
-        "sha": "e90e40ab367c66f99206a95bcd7e4ce249ce6b2a"
+        "sha": "d9e11b4ad3897c592b4c66eac3f59d51f6d40bc0"
       }
     },
     {
@@ -19,7 +19,7 @@
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "079dcce498117f9570cebe6e6cff254b38ba3860"
+        "sha": "0c868d49b8e05bc1f299bc773df9eb4ef9ed96e9"
       }
     }
   ],
@@ -75,10 +75,12 @@
     ".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",