[DOCS] Adds 7.16.0 release notes (#119856)

* [DOCS] Adds 7.16.0 release notes

* Updates aggregation-based link

* Updates aggregation-based link

* Updates aggregation-based link

* Updates aggregation-based link

* Adds #119079 to bug fixes

* Updates aggregation-based link

* Link fix

* Update docs/CHANGELOG.asciidoc

Co-authored-by: Greg Back <1045796+gtback@users.noreply.github.com>

* Fixes breaking changes links

* Adds Osquery breaking change

* Links

* Edits ML PR list

* More ML edits

* Updates with review comments

* Removes #111676

* Update docs/CHANGELOG.asciidoc

Co-authored-by: DeDe Morton <dede.morton@elastic.co>

* Update docs/CHANGELOG.asciidoc

Co-authored-by: DeDe Morton <dede.morton@elastic.co>

* Update docs/CHANGELOG.asciidoc

Co-authored-by: DeDe Morton <dede.morton@elastic.co>

* Update docs/CHANGELOG.asciidoc

Co-authored-by: DeDe Morton <dede.morton@elastic.co>

* Update docs/CHANGELOG.asciidoc

Co-authored-by: DeDe Morton <dede.morton@elastic.co>

* Observability review comments

* Update docs/CHANGELOG.asciidoc

Co-authored-by: Brandon Morelli <bmorelli25@gmail.com>

* Update docs/CHANGELOG.asciidoc

Co-authored-by: Brandon Morelli <bmorelli25@gmail.com>

* Update docs/CHANGELOG.asciidoc

Co-authored-by: Brandon Morelli <bmorelli25@gmail.com>

* Update docs/CHANGELOG.asciidoc

Co-authored-by: Brandon Morelli <bmorelli25@gmail.com>

* Fixes deprecation link

Co-authored-by: Greg Back <1045796+gtback@users.noreply.github.com>
Co-authored-by: lcawl <lcawley@elastic.co>
Co-authored-by: DeDe Morton <dede.morton@elastic.co>
Co-authored-by: Brandon Morelli <bmorelli25@gmail.com>

Author: 5 people