feat(server): handle account deleting properly (#12399)

<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit

- **New Features**
  - Users are now prevented from deleting their account if they own one or more team workspaces. A clear error message instructs users to transfer ownership or delete those workspaces first.
  - Disabled (banned) users are explicitly prevented from signing in or re-registering.
  - Added new error messages and translations to improve clarity around account deletion restrictions.

- **Bug Fixes**
  - Disabled users are now explicitly handled to prevent sign-in attempts.

- **Tests**
  - Introduced comprehensive end-to-end tests covering account deletion, banning, and re-registration scenarios.

- **Chores**
  - Improved event handling for user deletion and subscription cancellation.
  - Updated localization resources with new error messages.
  - Renamed payment event handler class for clarity.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/backend/server/src/__tests__/mocks/user.mock.ts

@@ -2,7 +2,7 @@ import { faker } from '@faker-js/faker';
 import { hashSync } from '@node-rs/argon2';
 import type { Prisma, User } from '@prisma/client';
 
-import type { UserFeatureName } from '../../models';
+import { FeatureConfigs, type UserFeatureName } from '../../models';
 import { Mocker } from './factory';
 
 export type MockUserInput = Prisma.UserCreateInput & {
@@ -15,33 +15,37 @@ export type MockedUser = Omit<User, 'password'> & {
 
 export class MockUser extends Mocker<MockUserInput, MockedUser> {
   override async create(input?: Partial<MockUserInput>) {
+    const { feature, ...userInput } = input ?? {};
     const password = input?.password ?? faker.internet.password();
     const user = await this.db.user.create({
       data: {
         email: faker.internet.email(),
         name: faker.person.fullName(),
         password: password ? hashSync(password) : undefined,
-        ...input,
+        ...userInput,
       },
     });
 
-    if (input?.feature) {
-      const feature = await this.db.feature.findFirst({
+    if (feature) {
+      const featureRecord = await this.db.feature.findFirst({
         where: {
-          name: input.feature,
+          name: feature,
         },
       });
 
-      if (!feature) {
+      if (!featureRecord) {
         throw new Error(
-          `Feature ${input.feature} does not exist in DB. You might forgot to run data-migration first.`
+          `Feature ${feature} does not exist in DB. You might forgot to run data-migration first.`
         );
       }
 
+      const config = FeatureConfigs[feature];
       await this.db.userFeature.create({
         data: {
           userId: user.id,
-          featureId: feature.id,
+          featureId: featureRecord.id,
+          name: feature,
+          type: config.type,
           reason: 'test',
           activated: true,
         },