Navlist passthrough action list group props (#2133)

* passthrough actionlist group props to navlist.group

* changeset

* pass through props

* fix pass through block

* Update docs/content/NavList.mdx

* avoid passing through action list props, but spread additional props to allow aria and data attributes through

Co-authored-by: Cole Bemis <colebemis@github.com>

.changeset/smooth-balloons-hope.md

@@ -0,0 +1,5 @@
+---
+'@primer/react': patch
+---
+
+Passthrough ActionList.Group props from NavList.Group

src/NavList/NavList.tsx

@@ -240,13 +240,14 @@ export type NavListGroupProps = {
   title?: string
 } & SxProp
 
+const defaultSx = {}
 // TODO: ref prop
-const Group = ({title, children, sx: sxProp = {}}: NavListGroupProps) => {
+const Group: React.VFC<NavListGroupProps> = ({title, children, sx: sxProp = defaultSx, ...props}) => {
   return (
     <>
       {/* Hide divider if the group is the first item in the list */}
       <ActionList.Divider sx={{'&:first-child': {display: 'none'}}} />
-      <ActionList.Group title={title} sx={sxProp}>
+      <ActionList.Group {...props} title={title} sx={sxProp}>
         {children}
       </ActionList.Group>
     </>