refactor(infra): remove setimmediate (#7975)

packages/frontend/electron/renderer/shell/index.tsx

@@ -1,4 +1,3 @@
-import 'setimmediate';
 import '@affine/component/theme/global.css';
 import '@affine/component/theme/theme.css';
 import '@affine/core/bootstrap/preload';

packages/frontend/mobile/src/polyfill/set-immediate.ts

@@ -1 +0,0 @@
-import 'setimmediate';

packages/frontend/web/src/polyfill/set-immediate.ts

@@ -1 +0,0 @@
-import 'setimmediate';