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/chart-data-query.service.ts

@@ -89,12 +89,12 @@ export class ChartDataQueryService {
 
     const primaryGroupByField = getFieldMetadata(
       groupByFieldMetadataId,
-      flatFieldMetadataMaps.byId,
+      flatFieldMetadataMaps,
     );
 
     const aggregateField = getFieldMetadata(
       aggregateFieldMetadataId,
-      flatFieldMetadataMaps.byId,
+      flatFieldMetadataMaps,
     );
 
     const isPrimaryFieldDate = isFieldMetadataDateKind(
@@ -146,7 +146,7 @@ export class ChartDataQueryService {
     if (isDefined(secondaryGroupByFieldMetadataId)) {
       const secondaryGroupByField = getFieldMetadata(
         secondaryGroupByFieldMetadataId,
-        flatFieldMetadataMaps.byId,
+        flatFieldMetadataMaps,
       );
 
       const isSecondaryFieldDate = isFieldMetadataDateKind(