fix(runtime): remove obsolete jQuery compatibility assets

tests/widget-system/single-cover-height-contract.test.cjs

@@ -128,7 +128,6 @@ test('single cover css owns no fallback padding and the scale var is gone', () =
     'assets/css/main.css',
     'assets/css/main.min.css',
     'assets/css/core/tokens.css',
-    'assets/css/frontend/compat-vars.css',
     'assets/css/build/public.css',
     'assets/css/build/public.min.css',
   ]) {