feat: add initial files for google.apps.events.subscriptions.v1#12435

parthea wants to merge 1 commit intomaingoogleapis/google-cloud-python:mainfrom

revert-12377-revert-12374-owlbot-bootstrapper-initial-PR-531e67961d6egoogleapis/google-cloud-python:revert-12377-revert-12374-owlbot-bootstrapper-initial-PR-531e67961d6eCopy head branch name to clipboard