Expose duplicate check on REST API and enable batch duplicate checks (#6328)

This PR was created by [GitStart](https://gitstart.com/) to address the
requirements from this ticket:
[TWNTY-5472](https://clients.gitstart.com/twenty/5449/tickets/TWNTY-5472).
This ticket was imported from:
[TWNTY-5472](https://github.com/twentyhq/twenty/issues/5472)

 --- 

### Description:
- Following what is already done in the code, we create a REST endpoint
that generates the Graphql query and returns its result.

### Refs: #5472


### Demo:

<https://www.loom.com/share/e0b1030f056945a0bf93bdd88ea01d8f?sid=6f128e8c-370b-4079-958e-0ea2d073a241>

FIxes #5472

---------

Co-authored-by: gitstart-twenty <gitstart-twenty@users.noreply.github.com>
Co-authored-by: gitstart-twenty <140154534+gitstart-twenty@users.noreply.github.com>
Co-authored-by: martmull <martmull@hotmail.fr>

packages/twenty-server/src/engine/api/rest/utils/clean-graphql-response.utils.ts

@@ -43,6 +43,16 @@ export const cleanGraphQLResponse = (input: any) => {
     } else if (isObject(input[key])) {
       // Recursively clean and assign nested objects under the data key
       output.data[key] = cleanObject(input[key]);
+    } else if (Array.isArray(input[key])) {
+      const itemsWithEdges = input[key].filter((item) => item.edges);
+      const cleanedObjArray = itemsWithEdges.map(({ edges, ...item }) => {
+        return {
+          ...item,
+          [key]: edges.map((edge) => cleanObject(edge.node)),
+        };
+      });
+
+      output.data = cleanedObjArray;
     } else {
       // Assign all other properties directly under the data key
       output.data[key] = input[key];