ci: the java team to merge auto-generated PRs (#2371)

b/379670583

Author: suztomo

.github/CODEOWNERS

@@ -10,6 +10,17 @@
 # for handwritten libraries, keep codeowner_team in .repo-metadata.json as owner
 **/*.java               @googleapis/api-pubsub
 
+# For generated Java code
+proto-*/                    @googleapis/yoshi-java @googleapis/api-pubsub
+grpc-*/                     @googleapis/yoshi-java @googleapis/api-pubsub
+# Generated code pattern in google-cloud-pubsub
+**/*Client.java             @googleapis/yoshi-java @googleapis/api-pubsub
+**/*Settings.java           @googleapis/yoshi-java @googleapis/api-pubsub
+**/*ClientHttpJsonTest.java @googleapis/yoshi-java @googleapis/api-pubsub
+**/*ClientTest.java         @googleapis/yoshi-java @googleapis/api-pubsub
+google-cloud-pubsub/src/main/java/com/google/cloud/pubsub/v1/stub/** @googleapis/yoshi-java @googleapis/api-pubsub
+google-cloud-pubsub/src/main/java/com/google/cloud/pubsub/v1/package-info.java @googleapis/yoshi-java @googleapis/api-pubsub
+google-cloud-pubsub/src/test/java/com/google/cloud/pubsub/v1/Mock* @googleapis/yoshi-java @googleapis/api-pubsub
 
 # The java-samples-reviewers team is the default owner for samples changes
 samples/**/*.java       @googleapis/java-samples-reviewers