feat: add integration tests (#6923)

### Summary

This PR introduces several integration tests, a mix of manually written
tests and those generated using the `generate-integration-tests` Python
script located in the `scripts` folder.

### Tests Added:
- **Authentication tests**: Validating login, registration, and token
handling.
- **FindMany queries**: Fetching multiple records for all existing
entities that do not require input arguments.

### How the Integration Tests Work:
- A `setupTest` function is called during the Jest test run. This
function initializes a test instance of the application and exposes it
on a dedicated port.
- Since tests are executed in isolated workers, they do not have direct
access to the in-memory app instance. Instead, the tests query the
application through the exposed port.
- A static accessToken is used, this one as a big expiration time so it
will never expire (365 years)
- The queries are executed, and the results are validated against
expected outcomes.

### Current State and Next Steps:
- These tests currently run using the existing development seed data. We
plan to introduce more comprehensive test data using `faker` to improve
coverage.
- At the moment, the only mutation tests implemented are for
authentication. Future updates should include broader mutation testing
for other entities.

---------

Co-authored-by: Charles Bochet <charles@twenty.com>

packages/twenty-server/src/app.module.ts

@@ -26,23 +26,15 @@ import { WorkspaceCacheStorageModule } from 'src/engine/workspace-cache-storage/
 import { ModulesModule } from 'src/modules/modules.module';
 
 import { CoreEngineModule } from './engine/core-modules/core-engine.module';
-
 @Module({
   imports: [
-    // Nest.js devtools, use devtools.nestjs.com to debug
-    // DevtoolsModule.registerAsync({
-    //   useFactory: (environmentService: EnvironmentService) => ({
-    //     http: environmentService.get('DEBUG_MODE'),
-    //     port: environmentService.get('DEBUG_PORT'),
-    //   }),
-    //   inject: [EnvironmentService],
-    // }),
     ConfigModule.forRoot({
       isGlobal: true,
+      envFilePath: process.env.NODE_ENV === 'test' ? '.env.test' : '.env',
     }),
     GraphQLModule.forRootAsync<YogaDriverConfig>({
       driver: YogaDriver,
-      imports: [CoreEngineModule, GraphQLConfigModule],
+      imports: [GraphQLConfigModule],
       useClass: GraphQLConfigService,
     }),
     TwentyORMModule,