chore: add codeowner_team to repo-metadata.json

.github/CODEOWNERS

@@ -4,8 +4,9 @@
 # For syntax help see:
 # https://help.github.com/en/github/creating-cloning-and-archiving-repositories/about-code-owners#codeowners-syntax
 
-# The @googleapis/api-bigquery is the default owner for changes in this repo
-*               @googleapis/api-bigquery @googleapis/yoshi-python
 
-# The python-samples-reviewers team is the default owner for samples changes
-/samples/   @googleapis/python-samples-owners @googleapis/api-bigquery @googleapis/yoshi-python
+# @googleapis/yoshi-python and @googleapis/api-bigquery are the default owners for changes in this repo
+*     @googleapis/yoshi-python @googleapis/api-bigquery
+
+# @googleapis/python-samples-owners and @googleapis/api-bigquery are the default owners for samples changes
+/samples/   @googleapis/python-samples-owners @googleapis/api-bigquery

.repo-metadata.json

@@ -10,5 +10,6 @@
   "repo": "googleapis/python-bigquery-reservation",
   "distribution_name": "google-cloud-bigquery-reservation",
   "api_id": "bigqueryreservation.googleapis.com",
-  "requires_billing": true
-}
+  "requires_billing": true,
+  "codeowner_team": "@googleapis/api-bigquery"
+}