[EuiAccordion] Remove will-change CSS (#6235)

* [REVERT ME] test datagrid full screen bug when nested within accordion

* [EuiAccordion] Remove `will-change` CSS

* changelog

* [PR feedback] typo

* Revert "[REVERT ME] test datagrid full screen bug when nested within accordion"

This reverts commit 052e679.

Author: Constance

src/components/accordion/accordion.styles.ts

@@ -79,7 +79,6 @@ export const euiAccordionChildWrapperStyles = ({ euiTheme }: UseEuiTheme) => ({
         ${euiTheme.animation.resistance},
       opacity ${euiTheme.animation.normal} ${euiTheme.animation.resistance};
     visibility: hidden;
-    will-change: opacity, visibility, ${logicals.height};
 
     &:focus {
       outline: none; // Hide focus ring because of tabindex=-1 on Safari

upcoming_changelogs/6235.md

@@ -0,0 +1,3 @@
+**Bug fixes**
+
+- Fixed `EuiDataGrid`'s broken fullscreen mode when nested within an `EuiAccordion`