Added className prop to AnchoredOverlay component for custom styling (#…

…4752)

* Added className prop to AnchoredOverlay component

### Description:
- Added `className` prop to allow custom styling of the `AnchoredOverlay` component
- This change addresses issue #4739

* Updated AnchoredOverlay documentation to include className prop

### Description:
- Added `className` prop to `AnchoredOverlay.docs.json`

* add changeset

* Revert "add changeset"

This reverts commit 4a59f6a.

* Updated the code according to PR#4741

### description:
- the previous PR, which also included the necessary changes: #4741
- only the changes to Storybook were kept

---------

Co-authored-by: Armagan Ersoz <broccolinisoup@github.com>

packages/react/src/AnchoredOverlay/AnchoredOverlay.docs.json

@@ -83,6 +83,12 @@
       "type": "Partial<FocusZoneHookSettings>",
       "defaultValue": "",
       "description": "Settings to apply to the focus zone on the internal `Overlay` component."
+    },
+    {
+      "name": "className",
+      "type": "string",
+      "defaultValue": "",
+      "description": "Class name for custom styling."
     }
   ]
 }