chore: add generation of pb2 files via owlbot/bazel

.github/.OwlBot.yaml

@@ -15,4 +15,12 @@
 docker:
   image: gcr.io/cloud-devrel-public-resources/owlbot-python:latest
 
+deep-remove-regex:
+  - /owl-bot-staging
+deep-copy-regex:
+  - source: /google/iam/(v1)/.*-v1-py/(.*policy.*|options.*)
+    dest: /owl-bot-staging/$1/google/iam/v1/$2
+  - source: /google/iam/v1/logging/(audit-data-py)/(.*audit_data.*)
+    dest: /owl-bot-staging/$1/google/iam/v1/logging/$2
+
 begin-after-commit-hash: 70f7f0525414fe4dfeb2fc2e81546b073f83a621