Release google-cloud-video_intelligence-v1 0.3.0 (googleapis#7843)

Release google-cloud-video_intelligence 3.0.1 (googleapis#7844)

Release google-cloud-firestore 2.3.0 (googleapis#7836)

#### Features

* Add error callbacks for listener threads
  * Add DocumentListener#last_error
  * Add DocumentListener#on_error
  * Add QueryListener#last_error
  * Add QueryListener#on_error

Release google-cloud-security_center-v1p1beta1 0.4.1 (googleapis#7814)

Release google-cloud-policy_troubleshooter 0.1.0 (googleapis#7824)

Initial release.

Release google-cloud-notebooks-v1beta1 0.2.0 (googleapis#7834)

Release google-cloud-notebooks 0.1.0 (googleapis#7826)

Initial release.

Release google-cloud-functions 0.1.0 (googleapis#7825)

Initial release.

Release google-cloud-billing-budgets 0.1.0 (googleapis#7827)

Initial release.

Release google-cloud-bigquery-reservation 0.1.0 (googleapis#7829)

Initial release.