Fix user deletion when workspace is deleted (#9321)

## Context
2 issues here:
- We use a metadata repository find method without providing a
workspaceId: In practice this is not an issue in this specific part but
let's avoid that pattern
- await this.workspaceService.deleteWorkspace(workspaceId); deletes
almost everything, emitting an event on workspaceMember could
potentially bring issues and not much values imho

packages/twenty-server/src/engine/core-modules/user/services/user.service.ts

@@ -6,23 +6,23 @@ import { TypeOrmQueryService } from '@ptc-org/nestjs-query-typeorm';
 import { Repository } from 'typeorm';
 
 import { TypeORMService } from 'src/database/typeorm/typeorm.service';
+import { DatabaseEventAction } from 'src/engine/api/graphql/graphql-query-runner/enums/database-event-action';
+import {
+  AuthException,
+  AuthExceptionCode,
+} from 'src/engine/core-modules/auth/auth.exception';
 import { User } from 'src/engine/core-modules/user/user.entity';
+import { userValidator } from 'src/engine/core-modules/user/user.validate';
 import { WorkspaceService } from 'src/engine/core-modules/workspace/services/workspace.service';
 import {
   Workspace,
   WorkspaceActivationStatus,
 } from 'src/engine/core-modules/workspace/workspace.entity';
 import { DataSourceService } from 'src/engine/metadata-modules/data-source/data-source.service';
+import { ObjectMetadataEntity } from 'src/engine/metadata-modules/object-metadata/object-metadata.entity';
 import { TwentyORMGlobalManager } from 'src/engine/twenty-orm/twenty-orm-global.manager';
 import { WorkspaceEventEmitter } from 'src/engine/workspace-event-emitter/workspace-event-emitter';
 import { WorkspaceMemberWorkspaceEntity } from 'src/modules/workspace-member/standard-objects/workspace-member.workspace-entity';
-import { DatabaseEventAction } from 'src/engine/api/graphql/graphql-query-runner/enums/database-event-action';
-import { ObjectMetadataEntity } from 'src/engine/metadata-modules/object-metadata/object-metadata.entity';
-import { userValidator } from 'src/engine/core-modules/user/user.validate';
-import {
-  AuthException,
-  AuthExceptionCode,
-} from 'src/engine/core-modules/auth/auth.exception';
 
 // eslint-disable-next-line @nx/workspace-inject-workspace-repository
 export class UserService extends TypeOrmQueryService<User> {
@@ -100,16 +100,19 @@ export class UserService extends TypeOrmQueryService<User> {
       `DELETE FROM ${dataSourceMetadata.schema}."workspaceMember" WHERE "userId" = '${userId}'`,
     );
 
-    if (workspaceMembers.length === 1) {
-      await this.workspaceService.deleteWorkspace(workspaceId);
-    }
-
     const objectMetadata = await this.objectMetadataRepository.findOneOrFail({
       where: {
         nameSingular: 'workspaceMember',
+        workspaceId: workspaceId,
       },
     });
 
+    if (workspaceMembers.length === 1) {
+      await this.workspaceService.deleteWorkspace(workspaceId);
+
+      return;
+    }
+
     this.workspaceEventEmitter.emitDatabaseBatchEvent({
       objectMetadataNameSingular: 'workspaceMember',
       action: DatabaseEventAction.DELETED,