Determine whether to use `librarian` automation for releasing

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Determine whether librarian automation is needed for this repository. When a repository is onboarded to librarian automation , release PRs will be created / reviewed and merged automatically every other week without interaction from the maintainers. To configure librarian automation, follow step 1 here: https://github.com/googleapis/librarian/blob/main/doc/repository-library-onboarding.md

If librarian automation is not configured, release PRs will not be opened automatically. Release PRs will need to be created/reviewed/merged manually by the maintainers of this repo using the steps here: https://github.com/googleapis/librarian/blob/main/doc/library-maintainer-guide.md#initiating-a-release.