[2/n]: Rest API -> TwentyORM migration POST rest/* (#9986)

# This PR

- Addressing #3644 
- Migrates the `POST rest/*` endpoint to use TwentyORM directly
- Adds integration tests
- Refactors common login in the v2 service file
- Refactors test utility files

packages/twenty-server/test/integration/rest/utils/make-rest-api-request.util.ts

@@ -4,15 +4,23 @@ import request from 'supertest';
 
 export type RestAPIRequestMethod = 'get' | 'post' | 'put' | 'patch' | 'delete';
 
-export const makeRestAPIRequest = (
-  method: RestAPIRequestMethod,
-  path: string,
-  headers: IncomingHttpHeaders = {},
-) => {
+interface RestAPIRequestParams {
+  method: RestAPIRequestMethod;
+  path: string;
+  headers?: IncomingHttpHeaders;
+  body?: any;
+}
+
+export const makeRestAPIRequest = ({
+  method,
+  path,
+  headers = {},
+  body,
+}: RestAPIRequestParams) => {
   const client = request(`http://localhost:${APP_PORT}`);
 
-  return client[method]('/rest' + path)
+  return client[method](`/rest${path}`)
     .set('Authorization', `Bearer ${ACCESS_TOKEN}`)
-    .set({ ...headers })
-    .send();
+    .set(headers)
+    .send(body ? JSON.stringify(body) : undefined);
 };