chore: add changelog

Author: weronikaolejniczak

packages/eui/changelogs/upcoming/9643.md

@@ -0,0 +1,15 @@
+- Replaced native browser `title` attributes with `EuiToolTip` across the following components for consistent tooltips:
+  - `EuiAvatar`
+  - `EuiBasicTable`
+  - `EuiBreadcrumbs`
+  - `EuiComboBox`
+  - `EuiDataGrid`
+  - `EuiAutoRefresh`
+  - `EuiSuperDatePicker`
+  - `EuiFieldPassword`
+  - `EuiMarkdownEditor`
+  - `EuiPagination`
+  - `EuiSearchBar`
+  - `EuiSelectable`
+  - `EuiTextTruncate`
+- Extended `EuiToolTip`'s `display` prop to support `"flex"`