chore: use repo metadata to populate nodejs CODEOWNERS (googleapis#842)

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Source-Link: googleapis/synthtool@318e351

.github/CODEOWNERS

@@ -5,6 +5,5 @@
 # https://help.github.com/en/github/creating-cloning-and-archiving-repositories/about-code-owners#codeowners-syntax
 
 
-# The api-bigtable team is the default owner for anything not
-# explicitly taken by someone else.
-*            @googleapis/api-bigtable @googleapis/yoshi-nodejs
+# The yoshi-nodejs team is the default owner for nodejs repositories.
+*     @googleapis/yoshi-nodejs @googleapis/api-bigtable

synth.metadata

@@ -4,7 +4,7 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/nodejs-bigtable.git",
-        "sha": "8105dea272de44e69915d3e62e5b5add106b54cb"
+        "sha": "da875a17c8a7a20d020e534a5a315fec45630e83"
       }
     },
     {
@@ -19,7 +19,7 @@
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "57c23fa5705499a4181095ced81f0ee0933b64f6"
+        "sha": "318e351e26ba65b2b3cfa3f61b3b64e3540c3525"
       }
     }
   ],