chore: add changelogs

Author: mgadewoll

packages/eui-theme-borealis/changelogs/upcoming/8595.md

@@ -0,0 +1,10 @@
+- Added `flags.buttonVariant` with value `refresh` to `euiThemeBorealis`
+- Added new button background component tokens:
+  - `background{color}Hover`
+  - `background{color}Active`
+  - `backgroundFilled{color}Hover`
+  - `backgroundFilled{color}Active`
+  - `backgroundEmpty{color}Hover`
+  - `backgroundEmpty{color}Active`
+- Updated `backgroundLightText` token value to `shade120`
+

packages/eui-theme-common/changelogs/upcoming/8595.md

@@ -0,0 +1,10 @@
+- Added support for `buttonVariant` on `_EuiThemeFlags`
+- Added support for new button background component tokens:
+  - `background{color}Hover`
+  - `background{color}Active`
+  - `backgroundFilled{color}Hover`
+  - `backgroundFilled{color}Active`
+  - `backgroundEmpty{color}Hover`
+  - `backgroundEmpty{color}Active`
+- Updated `getTokenName` util making the `variant` argument optional
+

packages/eui/changelogs/upcoming/8595.md

@@ -0,0 +1,13 @@
+- Added new `refresh` design variant for button components:
+  - `EuiButton`
+  - `EuiButtonEmpty`
+  - `EuiButtonIcon`
+- Added `flags.buttonVariant` with value `classic` to `euiThemeAmsterdam`
+- Added new button background component tokens to Amsterdam theme:
+  - `background{color}Hover`
+  - `background{color}Active`
+  - `backgroundFilled{color}Hover`
+  - `backgroundFilled{color}Active`
+  - `backgroundEmpty{color}Hover`
+  - `backgroundEmpty{color}Active`
+