refactor(nodejs): move build cop to flakybot (#572)

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Source-Link: googleapis/synthtool@57c23fa

packages/google-privacy-dlp/synth.metadata

@@ -4,7 +4,7 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/nodejs-dlp.git",
-        "sha": "23d15d9e02ab4b9a46a60708022a23ff889827cc"
+        "sha": "e76fe15580137e2396831308c17f4a01fe0b330a"
       }
     },
     {
@@ -19,7 +19,7 @@
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "363fe305e9ce34a6cd53951c6ee5f997094b54ee"
+        "sha": "57c23fa5705499a4181095ced81f0ee0933b64f6"
       }
     }
   ],