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/engine/metadata-modules/view/tools/__tests__/view-tools.factory.spec.ts

@@ -33,16 +33,19 @@ describe('ViewToolsFactory', () => {
   };
 
   const mockFlatObjectMetadataMaps = {
-    byId: {
-      [mockObjectMetadataId]: {
+    byUniversalIdentifier: {
+      'object-universal-id': {
         id: mockObjectMetadataId,
         nameSingular: mockObjectNameSingular,
         namePlural: 'companies',
         labelSingular: 'Company',
         labelPlural: 'Companies',
+        universalIdentifier: 'object-universal-id',
       },
     },
-    idByUniversalIdentifier: {},
+    universalIdentifierById: {
+      [mockObjectMetadataId]: 'object-universal-id',
+    },
     universalIdentifiersByApplicationId: {},
   };
 

packages/twenty-server/src/engine/metadata-modules/view/tools/view-tools.factory.ts

@@ -88,9 +88,9 @@ export class ViewToolsFactory {
         },
       );
 
-    const objectMetadata = Object.values(flatObjectMetadataMaps.byId).find(
-      (obj) => obj?.nameSingular === objectNameSingular,
-    );
+    const objectMetadata = Object.values(
+      flatObjectMetadataMaps.byUniversalIdentifier,
+    ).find((obj) => obj?.nameSingular === objectNameSingular);
 
     if (!objectMetadata) {
       throw new Error(