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/jest.config.ts

@@ -1,22 +1,27 @@
-module.exports = {
+import { JestConfigWithTsJest } from 'ts-jest';
+
+const jestConfig: JestConfigWithTsJest = {
   // to enable logs, comment out the following line
   silent: true,
   clearMocks: true,
-  preset: 'ts-jest',
-  testEnvironment: 'node',
-  modulePathIgnorePatterns: ['<rootDir>/dist'],
-  moduleFileExtensions: ['js', 'json', 'ts'],
-  moduleNameMapper: {
-    '^src/(.*)': '<rootDir>/src/$1',
-  },
+  displayName: 'twenty-server',
   rootDir: './',
+  testEnvironment: 'node',
+  transformIgnorePatterns: ['../../node_modules/'],
   testRegex: '.*\\.spec\\.ts$',
   transform: {
     '^.+\\.(t|j)s$': 'ts-jest',
   },
+  moduleNameMapper: {
+    '^src/(.*)': '<rootDir>/src/$1',
+  },
+  moduleFileExtensions: ['js', 'json', 'ts'],
+  modulePathIgnorePatterns: ['<rootDir>/dist'],
   fakeTimers: {
     enableGlobally: true,
   },
   collectCoverageFrom: ['**/*.(t|j)s'],
   coverageDirectory: '../coverage',
 };
+
+export default jestConfig;