feat: added support for className to <AnchoredOverlay> (#4741)

* feat: added support for className to <AnchoredOverlay>

* feat: add support for className to <AnchoredOverlay>

* add changeset

---------

Co-authored-by: Prince Yadav <prince1.yadav@tataaig.com>
Co-authored-by: Armağan <broccolinisoup@github.com>

.changeset/sixty-trains-flow.md

@@ -0,0 +1,5 @@
+---
+'@primer/react': patch
+---
+
+AnchoredOverlay: Add 'className' prop to the component

packages/react/src/AnchoredOverlay/AnchoredOverlay.tsx

@@ -79,6 +79,11 @@ interface AnchoredOverlayBaseProps extends Pick<OverlayProps, 'height' | 'width'
    * Settings to apply to the Focus Zone on the internal `Overlay` component.
    */
   focusZoneSettings?: Partial<FocusZoneHookSettings>
+
+  /**
+   * Optional className to be added to the overlay component.
+   */
+  className?: string
 }
 
 export type AnchoredOverlayProps = AnchoredOverlayBaseProps &
@@ -106,6 +111,7 @@ export const AnchoredOverlay: React.FC<React.PropsWithChildren<AnchoredOverlayPr
   align = 'start',
   alignmentOffset,
   anchorOffset,
+  className,
 }) => {
   const anchorRef = useProvidedRefOrCreate(externalAnchorRef)
   const [overlayRef, updateOverlayRef] = useRenderForcingRef<HTMLDivElement>()
@@ -191,6 +197,7 @@ export const AnchoredOverlay: React.FC<React.PropsWithChildren<AnchoredOverlayPr
           top={position?.top || 0}
           left={position?.left || 0}
           anchorSide={position?.anchorSide}
+          className={className}
           {...overlayProps}
         >
           {children}