Prepare v0.70.0 (#1153)
Prepare v0.70.0 (#1153)

* Prepare v0.70.0

* Add cloud-pubsub minor release

* Includes all the small changes in the release

* Patch release for cloud-core

* Patch release for cloud-bigtable

* Fixed the versions in docs/manifest.json

googleapis/google-cloud-php-dlp,googleapis/google-cloud-php-dlp