Rewrite AvatarOverlay component with React hooks (#24543)

app/javascript/mastodon/components/__tests__/__snapshots__/avatar_overlay-test.jsx.snap

@@ -3,6 +3,8 @@
 exports[`<AvatarOverlay renders a overlay avatar 1`] = `
 <div
   className="account__avatar-overlay"
+  onMouseEnter={[Function]}
+  onMouseLeave={[Function]}
   style={
     {
       "height": 46,
@@ -15,8 +17,6 @@ exports[`<AvatarOverlay renders a overlay avatar 1`] = `
   >
     <div
       className="account__avatar"
-      onMouseEnter={[Function]}
-      onMouseLeave={[Function]}
       style={
         {
           "height": "36px",
@@ -35,8 +35,6 @@ exports[`<AvatarOverlay renders a overlay avatar 1`] = `
   >
     <div
       className="account__avatar"
-      onMouseEnter={[Function]}
-      onMouseLeave={[Function]}
       style={
         {
           "height": "24px",