Update changelog for r2.2.0 (#12585) (#12586)

* beep boop: Update changelog



* Add 2.2.0 changelog highlights



* Add space between changelog versions




---------

Signed-off-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
Signed-off-by: Charlie Truong <[email protected]>
Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: Charlie Truong <[email protected]>

Author: 3 people