feat(wizard): unity popular category (#35181)

static/app/data/platformCategories.tsx

@@ -26,6 +26,7 @@ export const popularPlatformCategories = [
   'apple-ios',
   'flutter',
   'dart-flutter',
+  'unity',
 ] as const;
 
 export const frontend = [
@@ -39,6 +40,7 @@ export const frontend = [
   'javascript-gatsby',
   'javascript-vue',
   'javascript-nextjs',
+  'unity',
 ] as const;
 
 export const mobile = [