feat: [AiPlatform] add VALIDATED Function Calling mode to v1 (#9025)

* feat: Add new `embed_content_config` to message `EmbedContentRequest`

PiperOrigin-RevId: 885256653

Source-Link: googleapis/googleapis@9d5f10d

Source-Link: googleapis/googleapis-gen@c11bedb
Copy-Tag: eyJwIjoiQWlQbGF0Zm9ybS8uT3dsQm90LnlhbWwiLCJoIjoiYzExYmVkYjVkY2QxYzNkMDQxMjA5NjBmYzJlNjY3M2EwNzhlZjdkNyJ9

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

* feat: add `VALIDATED` Function Calling mode to v1

PiperOrigin-RevId: 885373782

Source-Link: googleapis/googleapis@ebfdba3

Source-Link: googleapis/googleapis-gen@0055864
Copy-Tag: eyJwIjoiQWlQbGF0Zm9ybS8uT3dsQm90LnlhbWwiLCJoIjoiMDA1NTg2NDVjNjQ0ZWNjMWM3YTlhYzMzNzM3NjAxMmZhYmM0MjNjYyJ9

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

---------

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

Author: gcf-owl-bot[bot]