enhance(backend/test): Migrate tests to vitest (#16935)

* wip

* update fake-timers and migrate

* fix

* remove jest-mock

* fix

* fix

* fix

* fix

* attempt to fix unit tests

* attempt to fix e2e tests

* fix federation test [ci skip]

* attempt to fix e2e tests

* fix typecheck

* fix unit tests

* fix

* attempt to fix e2e

* fix

* Revert "attempt to fix e2e"

This reverts commit b7b7b05d85.

* attempt to fix e2e

* revert attempt to fix e2e

* update deps

* update vitest

* migrate

* attempt to fix e2e

* update

* fix

* remove vite swc plugin as oxc parser can handle decorators

* attempt to fix drive/files/create test

* Revert "attempt to fix drive/files/create test"

This reverts commit 4715153375.

* fix: エンドポイントにまつわるテストをunitからe2eに移動

* attempt to fix e2e

* remove swc

* attempt to fix e2e

* Revert "attempt to fix e2e"

This reverts commit 9fb86a4076.

* add logs for debug

* attempt to fix e2e

* Partially revert "attempt to fix e2e"

This reverts commit fb0008c85a.

* attempt to fix test

* fix: attempt to fix test

* Revert "fix: attempt to fix test"

This reverts commit ed2f5c40e8.

* Revert "attempt to fix test"

This reverts commit d7329c46f1.

* attempt to fix e2e

* fix: surpass eventemitter warning by increasing defaultMaxListeners

* attempt to fix e2e

* fix

* fix e2e not ending properly

* exp: add hanging-process reporter for investigation

* Revert "exp: add hanging-process reporter for investigation"

This reverts commit 26851f8282.

* update changelog

packages/backend/test/unit/entities/UserEntityService.ts

@@ -4,6 +4,7 @@
  */
 
 import { Test, TestingModule } from '@nestjs/testing';
+import { describe, expect, beforeAll, afterAll, test } from 'vitest';
 import type { MiUser } from '@/models/User.js';
 import { UserEntityService } from '@/core/entities/UserEntityService.js';
 import { GlobalModule } from '@/GlobalModule.js';