chore: remove more libs for repo split

[busunkim96]

1. automl: https://github.com/googleapis/python-automl
2. cloudbuild: https://github.com/googleapis/python-cloudbuild
3. container: https://github.com/googleapis/python-container
4. containeranalysis: https://github.com/googleapis/python-containeranalysis
5. datacatalog https://github.com/googleapis/python-datacatalog
6. datalabeling: https://github.com/googleapis/python-datalabeling
7. dlp: https://github.com/googleapis/python-dlp
8. dns: https://github.com/googleapis/python-dns
9. documentai: https://github.com/googleapis/python-documentai (unlisted in README because this is a private library with no releases)
10. translate: https://github.com/googleapis/python-translate
11. texttospeech: https://github.com/googleapis/python-texttospeech
12. webrisk: https://github.com/googleapis/python-webrisk
13. websecurityscanner: https://github.com/googleapis/python-websecurityscanner

[busunkim96]

Kokoro configs have been removed internally and in GitHub, merging.