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-integration.config.ts

@@ -0,0 +1,34 @@
+import { JestConfigWithTsJest, pathsToModuleNameMapper } from 'ts-jest';
+
+// eslint-disable-next-line @typescript-eslint/no-var-requires
+const tsConfig = require('./tsconfig.json');
+
+const jestConfig: JestConfigWithTsJest = {
+  silent: false,
+  verbose: true,
+  moduleFileExtensions: ['js', 'json', 'ts'],
+  rootDir: '.',
+  testEnvironment: 'node',
+  testRegex: '.integration-spec.ts$',
+  modulePathIgnorePatterns: ['<rootDir>/dist'],
+  globalSetup: '<rootDir>/test/utils/setup-test.ts',
+  globalTeardown: '<rootDir>/test/utils/teardown-test.ts',
+  testTimeout: 15000,
+  moduleNameMapper: {
+    ...pathsToModuleNameMapper(tsConfig.compilerOptions.paths),
+    'twenty-emails': '<rootDir>/../twenty-emails/dist/index.js',
+  },
+  fakeTimers: {
+    enableGlobally: true,
+  },
+  transform: {
+    '^.+\\.(t|j)s$': 'ts-jest',
+  },
+  globals: {
+    APP_PORT: 4000,
+    ACCESS_TOKEN:
+      'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIyMDIwMjAyMC05ZTNiLTQ2ZDQtYTU1Ni04OGI5ZGRjMmIwMzQiLCJ3b3Jrc3BhY2VJZCI6IjIwMjAyMDIwLTFjMjUtNGQwMi1iZjI1LTZhZWNjZjdlYTQxOSIsIndvcmtzcGFjZU1lbWJlcklkIjoiMjAyMDIwMjAtMDY4Ny00YzQxLWI3MDctZWQxYmZjYTk3MmE3IiwiaWF0IjoxNzI2NDkyNTAyLCJleHAiOjEzMjQ1MDE2NTAyfQ.zM6TbfeOqYVH5Sgryc2zf02hd9uqUOSL1-iJlMgwzsI',
+  },
+};
+
+export default jestConfig;