[8.16] [Docs] Adds 8.16.0 release notes (elastic#198166) (elastic#199014

)

# Backport

This will backport the following commits from `main` to `8.16`:
- [[Docs] Adds 8.16.0 release notes
(elastic#198166)](elastic#198166)

<!--- Backport version: 9.4.3 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sqren/backport)

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Co-authored-by: florent-leborgne <florent.leborgne@elastic.co>