chore: add api_shortname and library_type to repo metadata (#2867)

Author: parthea

Diff for: .repo-metadata.json

@@ -1,9 +1,11 @@
 {
   "name": "googleapis",
   "name_pretty": "Google APIs Node.js Client",
-  "release_level": "beta",
+  "release_level": "preview",
   "language": "nodejs",
   "repo": "googleapis/google-api-nodejs-client",
   "distribution_name": "googleapis",
-  "client_documentation": "https://googleapis.dev/nodejs/googleapis/latest"
-}
+  "client_documentation": "https://googleapis.dev/nodejs/googleapis/latest",
+  "api_shortname": "googleapis",
+  "library_type": "REST"
+}