chore(python): add .github/CODEOWNERS as a templated file (#191)

Author: gcf-owl-bot[bot]

packages/google-cloud-bigquery-reservation/.github/.OwlBot.lock.yaml

@@ -1,3 +1,3 @@
 docker:
   image: gcr.io/cloud-devrel-public-resources/owlbot-python:latest
-  digest: sha256:4ee57a76a176ede9087c14330c625a71553cf9c72828b2c0ca12f5338171ba60
+  digest: sha256:0e18b9475fbeb12d9ad4302283171edebb6baf2dfca1bd215ee3b34ed79d95d7

packages/google-cloud-bigquery-reservation/.github/CODEOWNERS

@@ -3,10 +3,10 @@
 #
 # For syntax help see:
 # https://help.github.com/en/github/creating-cloning-and-archiving-repositories/about-code-owners#codeowners-syntax
+# Note: This file is autogenerated. To make changes to the codeowner team, please update .repo-metadata.json.
 
-
-# @googleapis/yoshi-python and @googleapis/api-bigquery are the default owners for changes in this repo
+# @googleapis/yoshi-python @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
+# @googleapis/python-samples-owners @googleapis/api-bigquery are the default owners for samples changes
 /samples/   @googleapis/python-samples-owners @googleapis/api-bigquery