Refactor flat entity maps to be universal oriented (#17665)

# Introduction
In preparation of the workspace agnostic builder, we're migrating
`FlatEntityMaps` to be universal identifier oriented and based
As in the builder context there're won't be any ids at all
Please also note that the FlatEntity is a UniversalFlatEntity superset

From
```ts
import { type SyncableFlatEntity } from 'src/engine/metadata-modules/flat-entity/types/flat-entity-from.type';

export type FlatEntityMaps<T extends SyncableFlatEntity> = {
  byId: Partial<Record<string, T>>;
  idByUniversalIdentifier: Partial<Record<string, string>>;
  universalIdentifiersByApplicationId: Partial<Record<string, string[]>>;
};
```

To
```ts
export type FlatEntityMaps<
  T extends SyncableFlatEntity | UniversalSyncableFlatEntity,
> = {
  byUniversalIdentifier: Partial<Record<string, T>>;
  universalIdentifierById: Partial<Record<string, string>>;
  universalIdentifiersByApplicationId: Partial<Record<string, string[]>>; // this might make more sense to be migrated to universalIdentifiersByApplicationUniversalIdentifier but it's the main topic of this PR
};
```

## Low level maps tools
Had to refactor find | create | delete | replace | find-many | get-sub
tools ( through mutations and or throw equivalent )

packages/twenty-server/src/modules/dashboard/chart-data/services/pie-chart-data.service.ts

@@ -8,6 +8,7 @@ import {
 } from 'twenty-shared/utils';
 
 import { AuthContext } from 'src/engine/core-modules/auth/types/auth-context.type';
+import { findFlatEntityByIdInFlatEntityMaps } from 'src/engine/metadata-modules/flat-entity/utils/find-flat-entity-by-id-in-flat-entity-maps.util';
 import { WorkspaceManyOrAllFlatEntityMapsCacheService } from 'src/engine/metadata-modules/flat-entity/services/workspace-many-or-all-flat-entity-maps-cache.service';
 import { FlatFieldMetadata } from 'src/engine/metadata-modules/flat-field-metadata/types/flat-field-metadata.type';
 import { PieChartConfigurationDTO } from 'src/engine/metadata-modules/page-layout-widget/dtos/pie-chart-configuration.dto';
@@ -77,7 +78,10 @@ export class PieChartDataService {
         );
       }
 
-      const flatObjectMetadata = flatObjectMetadataMaps.byId[objectMetadataId];
+      const flatObjectMetadata = findFlatEntityByIdInFlatEntityMaps({
+        flatEntityId: objectMetadataId,
+        flatEntityMaps: flatObjectMetadataMaps,
+      });
 
       if (!isDefined(flatObjectMetadata)) {
         throw new ChartDataException(
@@ -91,7 +95,7 @@ export class PieChartDataService {
 
       const groupByField = getFieldMetadata(
         configuration.groupByFieldMetadataId,
-        flatFieldMetadataMaps.byId,
+        flatFieldMetadataMaps,
       );
 
       const limit =
@@ -100,11 +104,11 @@ export class PieChartDataService {
 
       const objectIdByNameSingular: Record<string, string> = {};
 
-      for (const objectId in flatObjectMetadataMaps.byId) {
-        const objMetadata = flatObjectMetadataMaps.byId[objectId];
-
+      for (const objMetadata of Object.values(
+        flatObjectMetadataMaps.byUniversalIdentifier,
+      )) {
         if (isDefined(objMetadata)) {
-          objectIdByNameSingular[objMetadata.nameSingular] = objectId;
+          objectIdByNameSingular[objMetadata.nameSingular] = objMetadata.id;
         }
       }