chore: update ownership/routing for repo (#1001)

This PR effectively moves ownership for this repo to the python language team, and removes api-bigquery as the defacto code owner.

Author: shollyman

.github/CODEOWNERS

@@ -5,8 +5,8 @@
 # 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-bigquery @googleapis/api-bigquery-dataframe are the default owners for changes in this repo
-*     @googleapis/yoshi-python @googleapis/api-bigquery @googleapis/api-bigquery-dataframe
+# @googleapis/yoshi-python @googleapis/python-core-client-libraries @googleapis/api-bigquery-dataframe are the default owners for changes in this repo
+*     @googleapis/yoshi-python @googleapis/python-core-client-libraries @googleapis/api-bigquery-dataframe
 
-# @googleapis/python-samples-reviewers @googleapis/api-bigquery @googleapis/api-bigquery-dataframe are the default owners for samples changes
-/samples/   @googleapis/python-samples-reviewers @googleapis/api-bigquery @googleapis/api-bigquery-dataframe
+# @googleapis/python-samples-reviewers @googleapis/python-core-client-libraries @googleapis/api-bigquery-dataframe are the default owners for samples changes
+/samples/   @googleapis/python-samples-reviewers @googleapis/python-core-client-libraries @googleapis/api-bigquery-dataframe

.github/blunderbuss.yml

@@ -4,17 +4,17 @@
 # Note: This file is autogenerated. To make changes to the assignee
 # team, please update `codeowner_team` in `.repo-metadata.json`.
 assign_issues:
-  - googleapis/api-bigquery
+  - googleapis/python-core-client-libraries
   - googleapis/api-bigquery-dataframe
 
 assign_issues_by:
   - labels:
       - "samples"
     to:
       - googleapis/python-samples-reviewers
-      - googleapis/api-bigquery
+      - googleapis/python-core-client-libraries
       - googleapis/api-bigquery-dataframe
 
 assign_prs:
-  - googleapis/api-bigquery
+  - googleapis/python-core-client-libraries
   - googleapis/api-bigquery-dataframe

.repo-metadata.json

@@ -11,5 +11,5 @@
     "distribution_name": "pandas-gbq",
     "api_id": "bigquery.googleapis.com",
     "default_version": "",
-    "codeowner_team": "@googleapis/api-bigquery @googleapis/api-bigquery-dataframe"
+    "codeowner_team": "@googleapis/python-core-client-libraries @googleapis/api-bigquery-dataframe"
 }