[REQUIRES_FULL_CACHE_FLUSH_WHEN_RELEASED] Refactor FlatEntity to be UniversalFlatEntity superset (#17452)

# Introduction
In this PR we're refactoring the `FlatEntity` type to become a superset
of the `UniversalFlatEntity`.
Right now we're storing all the extra properties in `__universal`
property, at some point it might just be sibling to other entity and we
might rely on the `propertiesToCompare` constants and TypeScript
allowing passing a superset type into a smaller subset type

## FromTo utils
The entity to flat entity method now computes the universal information,
standardized a typing and pattern to do

## Example
Also strictly type
```ts
    "bbb019ea-6205-498c-aea5-67bc53bce8a9": {
      "workspaceId": "20202020-1c25-4d02-bf25-6aeccf7ea419",
      "universalIdentifier": "20202020-d111-4d11-8d11-da5ab0a11002",
      "applicationId": "d01b010d-b984-465b-b40b-370e954e5188",
      "id": "bbb019ea-6205-498c-aea5-67bc53bce8a9",
      "pageLayoutTabId": "791a512f-169f-4209-b731-aa86716668c6",
      "title": "Deals by Company",
      "type": "GRAPH",
      "objectMetadataId": "9e14efea-df5b-4c0e-aba9-cfe455f32397",
      "gridPosition": { "row": 0, "column": 6, "rowSpan": 6, "columnSpan": 6 },
      "configuration": {
        "color": "orange",
        "orderBy": "FIELD_ASC",
        "timezone": "UTC",
        "displayLegend": true,
        "displayDataLabel": false,
        "showCenterMetric": true,
        "configurationType": "PIE_CHART",
        "firstDayOfTheWeek": 0,
        "aggregateOperation": "COUNT",
        "groupBySubFieldName": "name",
        "groupByFieldMetadataId": "6673ff18-63d2-47a1-8f85-2b9b09ca27a5",
        "aggregateFieldMetadataId": "8d64ee41-5dd4-4de6-945a-7c0c18399715"
      },
      "createdAt": "2026-01-28T14:08:52.140Z",
      "updatedAt": "2026-01-28T14:08:52.140Z",
      "deletedAt": null,
      "__universal": {
        "universalIdentifier": "20202020-d111-4d11-8d11-da5ab0a11002",
        "applicationUniversalIdentifier": "20202020-64aa-4b6f-b003-9c74b97cee20",
        "pageLayoutTabUniversalIdentifier": "20202020-d011-4d11-8d11-da5ab0a01001",
        "objectMetadataUniversalIdentifier": "20202020-9549-49dd-b2b2-883999db8938",
        "gridPosition": {
          "row": 0,
          "column": 6,
          "rowSpan": 6,
          "columnSpan": 6
        },
        "configuration": {
          "color": "orange",
          "orderBy": "FIELD_ASC",
          "timezone": "UTC",
          "displayLegend": true,
          "displayDataLabel": false,
          "showCenterMetric": true,
          "configurationType": "PIE_CHART",
          "firstDayOfTheWeek": 0,
          "aggregateOperation": "COUNT",
          "groupBySubFieldName": "name",
          "aggregateFieldMetadataUniversalIdentifier": "20202020-d01a-4131-8a31-f123456789ab",
          "groupByFieldMetadataUniversalIdentifier": "20202020-cbac-457e-b565-adece5fc815f"
        }
      }
    },
```

packages/twenty-server/src/engine/workspace-cache/utils/create-id-to-universal-identifier-map.util.ts

@@ -0,0 +1,11 @@
+export const createIdToUniversalIdentifierMap = (
+  entities: { id: string; universalIdentifier: string }[],
+): Map<string, string> => {
+  const map = new Map<string, string>();
+
+  for (const entity of entities) {
+    map.set(entity.id, entity.universalIdentifier);
+  }
+
+  return map;
+};

packages/twenty-server/src/engine/workspace-cache/utils/regroup-entities-by-related-entity-id.ts

@@ -4,6 +4,8 @@ import { type AllMetadataName } from 'twenty-shared/metadata';
 import { type MetadataEntity } from 'src/engine/metadata-modules/flat-entity/types/metadata-entity.type';
 import { type MetadataManyToOneJoinColumn } from 'src/engine/metadata-modules/flat-entity/types/metadata-many-to-one-join-column.type';
 
+export type RegroupedEntity = { id: string; universalIdentifier: string };
+
 export type RegroupEntitiesByRelatedEntityIdArgs<T extends AllMetadataName> =
   MetadataManyToOneJoinColumn<T> extends never
     ? never
@@ -15,7 +17,7 @@ export const regroupEntitiesByRelatedEntityId = <T extends AllMetadataName>({
   entities,
   foreignKey,
 }: RegroupEntitiesByRelatedEntityIdArgs<T>) => {
-  const entitiesByRelatedEntityId = new Map<string, { id: string }[]>();
+  const entitiesByRelatedEntityId = new Map<string, RegroupedEntity[]>();
 
   for (const entity of entities) {
     const currentRelatedEntityId = entity[
@@ -30,9 +32,10 @@ export const regroupEntitiesByRelatedEntityId = <T extends AllMetadataName>({
       entitiesByRelatedEntityId.set(currentRelatedEntityId, []);
     }
 
-    entitiesByRelatedEntityId
-      .get(currentRelatedEntityId)!
-      .push({ id: entity.id });
+    entitiesByRelatedEntityId.get(currentRelatedEntityId)!.push({
+      id: entity.id,
+      universalIdentifier: entity.universalIdentifier,
+    });
   }
 
   return entitiesByRelatedEntityId;