chore: add changelog

Author: mgadewoll

packages/eui/changelogs/upcoming/9218.md

@@ -0,0 +1,7 @@
+- Updated `EuiPopover` default prop values of `hasArrow`, `position` and `offset`:
+  - Changed `hasArrow` to `false`
+  - Changed `position` to `downLeft`
+  - Changed `offset` to `4` when `hasArrow=false`
+- Updated `EuiInputPopover` `offset` default value to `2`
+- Updated `EuiTourStep` to not apply `hasArrow=true` by default when `decoration="none"`
+