chore: move gitattributes files to node templates (#657)

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Source-Link: googleapis/synthtool@3a00b7f

packages/google-cloud-dialogflow/.gitattributes

@@ -1,3 +1,4 @@
 *.ts text eol=lf
 *.js text eol=lf
 protos/* linguist-generated
+**/api-extractor.json  linguist-language=JSON-with-Comments

packages/google-cloud-dialogflow/synth.metadata

@@ -4,7 +4,7 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/nodejs-dialogflow.git",
-        "sha": "ab01f56885023219312cc7bf501ca41e2694627b"
+        "sha": "186c49157497f602aa80cbbf1d14b64844704daa"
       }
     },
     {
@@ -19,7 +19,7 @@
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "99c93fe09f8c1dca09dfc0301c8668e3a70dd796"
+        "sha": "3a00b7fea8c4c83eaff8eb207f530a2e3e8e1de3"
       }
     }
   ],