chore(python): add .github/CODEOWNERS as a templated file (#642)

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

Source-Link: googleapis/synthtool@c5026b3
Post-Processor: gcr.io/cloud-devrel-public-resources/owlbot-python:latest@sha256:0e18b9475fbeb12d9ad4302283171edebb6baf2dfca1bd215ee3b34ed79d95d7

* 🦉 Updates from OwlBot

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

* 🦉 Updates from OwlBot

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>
Co-authored-by: Anthonios Partheniou <partheniou@google.com>

.github/.OwlBot.lock.yaml

@@ -1,3 +1,3 @@
 docker:
   image: gcr.io/cloud-devrel-public-resources/owlbot-python:latest
-  digest: sha256:39ad8c0570e4f5d2d3124a509de4fe975e799e2b97e0f58aed88f8880d5a8b60
+  digest: sha256:0e18b9475fbeb12d9ad4302283171edebb6baf2dfca1bd215ee3b34ed79d95d7

.github/CODEOWNERS

@@ -3,9 +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 @googleapis/api-spanner-python are the default owners for changes in this repo
+*     @googleapis/yoshi-python @googleapis/api-spanner-python
 
-# The api-spanner-python team is the default owner for anything not
-# explicitly taken by someone else.
-*                               @googleapis/api-spanner-python @googleapis/yoshi-python
-/samples/                       @googleapis/api-spanner-python @googleapis/python-samples-owners
+# @googleapis/python-samples-owners @googleapis/api-spanner-python are the default owners for samples changes
+/samples/   @googleapis/python-samples-owners @googleapis/api-spanner-python