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/logic-function/logic-function.resolver.ts

@@ -87,7 +87,7 @@ export class LogicFunctionResolver {
           },
         );
 
-      return Object.values(flatLogicFunctionMaps.byId)
+      return Object.values(flatLogicFunctionMaps.byUniversalIdentifier)
         .filter(
           (flatLogicFunction): flatLogicFunction is FlatLogicFunction =>
             isDefined(flatLogicFunction) &&

packages/twenty-server/src/engine/metadata-modules/logic-function/services/logic-function.service.ts

@@ -9,6 +9,7 @@ import { FileStorageService } from 'src/engine/core-modules/file-storage/file-st
 import { getLogicFunctionBaseFolderPath } from 'src/engine/core-modules/logic-function/logic-function-build/utils/get-logic-function-base-folder-path.util';
 import { LogicFunctionLayerService } from 'src/engine/core-modules/logic-function/logic-function-layer/services/logic-function-layer.service';
 import { WorkspaceManyOrAllFlatEntityMapsCacheService } from 'src/engine/metadata-modules/flat-entity/services/workspace-many-or-all-flat-entity-maps-cache.service';
+import { findFlatEntityByIdInFlatEntityMaps } from 'src/engine/metadata-modules/flat-entity/utils/find-flat-entity-by-id-in-flat-entity-maps.util';
 import { findFlatEntityByIdInFlatEntityMapsOrThrow } from 'src/engine/metadata-modules/flat-entity/utils/find-flat-entity-by-id-in-flat-entity-maps-or-throw.util';
 import type { CreateLogicFunctionInput } from 'src/engine/metadata-modules/logic-function/dtos/create-logic-function.input';
 import type { UpdateLogicFunctionInput } from 'src/engine/metadata-modules/logic-function/dtos/update-logic-function.input';
@@ -223,7 +224,10 @@ export class LogicFunctionService {
         },
       );
 
-    const existingFlatLogicFunction = existingFlatLogicFunctionMaps.byId[id];
+    const existingFlatLogicFunction = findFlatEntityByIdInFlatEntityMaps({
+      flatEntityId: id,
+      flatEntityMaps: existingFlatLogicFunctionMaps,
+    });
 
     if (!isDefined(existingFlatLogicFunction)) {
       throw new LogicFunctionException(