add changelog entry

Author: ntsekouras

packages/components/CHANGELOG.md

@@ -13,6 +13,7 @@
 ### Enhancements
 
 - Add `FlowQuestion` component
+- Add `Header` component ([#103159](https://github.com/Automattic/wp-calypso/pull/103159)).
 - Add `SummaryButton` component ([#102827](https://github.com/Automattic/wp-calypso/pull/102827)).
 - Add `CoreBadge` component ([#103069](https://github.com/Automattic/wp-calypso/pull/103069)).