[WHEN_RELEASED_REQUIRES_CACHE_FLUSH] Object related record logic in v2 (#14937)

# Introduction
Initial motivation here was to migrate the object related records logic
from v1 to v2, please note that now in v2 views aren't records anymore
but core engine entities

## What's done
- Added specific label identifier targeting view field logic
- Handled side effects on viewField creation with lowest position on
object label identifier mutation
- Added viewField relations in field metadate entity + handled
optimistic in builder v2
- Added view relations in object metadata entity + handled optimistic in
builder v2
- Added integration tests covering the side effects and new validation
exceptions
- Sandardized cache computation
- Coverage on object metadata creation side effect on views and view
fields

## Coverage
```ts
 PASS  test/integration/graphql/suites/view/view-field/object-identifier-update-side-effect-on-view-field.integration-spec.ts
  View Field Resolver - Successful object metadata identifier update side effect on view field
    ✓ should create a view field on label identifier object metadata update if it does not exist on view (7 ms)
    ✓ Should not allow deleting a label identifier view field (17 ms)
    ✓ Should not allow destroying a label identifier view field (6 ms)
    ✓ Should not allow updating a label identifier view field visibility to false (8 ms)
    ✓ Should not allow creating a view field with a position lower than the label idenfitier view field (180 ms)
    ✓ Should not allow updated labelIdentifier view field with a position higher than existing other view field (346 ms)
    ✓ Should allow updated labelIdentifier view field with a position higher than existing other view field (434 ms)

Test Suites: 1 passed, 1 total
Tests:       7 passed, 7 total
Snapshots:   5 passed, 5 total
Time:        4.571 s, estimated 5 s
```

close https://github.com/twentyhq/core-team-issues/issues/1664

packages/twenty-server/src/engine/metadata-modules/flat-index-metadata/services/workspace-flat-index-map-cache.service.ts

@@ -8,6 +8,7 @@ import { CacheStorageService } from 'src/engine/core-modules/cache-storage/servi
 import { CacheStorageNamespace } from 'src/engine/core-modules/cache-storage/types/cache-storage-namespace.enum';
 import { EMPTY_FLAT_ENTITY_MAPS } from 'src/engine/core-modules/common/constant/empty-flat-entity-maps.constant';
 import { FlatEntityMaps } from 'src/engine/core-modules/common/types/flat-entity-maps.type';
+import { addFlatEntityToFlatEntityMapsOrThrow } from 'src/engine/core-modules/common/utils/add-flat-entity-to-flat-entity-maps-or-throw.util';
 import { FlatIndexMetadata } from 'src/engine/metadata-modules/flat-index-metadata/types/flat-index-metadata.type';
 import { fromIndexMetadataEntityToFlatIndexMetadata } from 'src/engine/metadata-modules/flat-index-metadata/utils/from-index-metadata-entity-to-flat-index-metadata.util';
 import { IndexMetadataEntity } from 'src/engine/metadata-modules/index-metadata/index-metadata.entity';
@@ -38,27 +39,20 @@ export class WorkspaceFlatIndexMapCacheService extends WorkspaceFlatMapCacheServ
         workspaceId,
       },
       withDeleted: true,
+      select: {
+        // Note: We need all IndexFieldMetadataEntity in order to build a FlatIndex
+        indexFieldMetadatas: true,
+      },
       relations: ['indexFieldMetadatas'],
     });
 
-    const flatIndexMaps = indexes.reduce<FlatEntityMaps<FlatIndexMetadata>>(
-      (flatEntityMaps, index) => {
-        const flatIndex = fromIndexMetadataEntityToFlatIndexMetadata(index);
+    return indexes.reduce((flatIndexMaps, indexEntity) => {
+      const flatIndex = fromIndexMetadataEntityToFlatIndexMetadata(indexEntity);
 
-        return {
-          byId: {
-            ...flatEntityMaps.byId,
-            [flatIndex.id]: flatIndex,
-          },
-          idByUniversalIdentifier: {
-            ...flatEntityMaps.idByUniversalIdentifier,
-            [flatIndex.universalIdentifier]: flatIndex.id,
-          },
-        };
-      },
-      EMPTY_FLAT_ENTITY_MAPS,
-    );
-
-    return flatIndexMaps;
+      return addFlatEntityToFlatEntityMapsOrThrow({
+        flatEntity: flatIndex,
+        flatEntityMaps: flatIndexMaps,
+      });
+    }, EMPTY_FLAT_ENTITY_MAPS);
   }
 }