Improve object metadata maps size (#8635)

## Context
The object metadata map is becoming quite large and its structure could
be simplified.
We are removing byNameSingular/byNamePlural keys, the former can be
retrieved through a new helper and the latter is not used in the code
base currently.

packages/twenty-server/src/engine/api/graphql/graphql-query-runner/resolvers/graphql-query-find-duplicates-resolver.service.ts

@@ -22,6 +22,7 @@ import { ObjectRecordsToGraphqlConnectionHelper } from 'src/engine/api/graphql/g
 import { settings } from 'src/engine/constants/settings';
 import { DUPLICATE_CRITERIA_COLLECTION } from 'src/engine/core-modules/duplicate/constants/duplicate-criteria.constants';
 import { ObjectMetadataItemWithFieldMaps } from 'src/engine/metadata-modules/types/object-metadata-item-with-field-maps';
+import { getObjectMetadataMapItemByNameSingular } from 'src/engine/metadata-modules/utils/get-object-metadata-map-item-by-name-singular.util';
 import { TwentyORMGlobalManager } from 'src/engine/twenty-orm/twenty-orm-global.manager';
 import { formatData } from 'src/engine/twenty-orm/utils/format-data.util';
 import { formatResult } from 'src/engine/twenty-orm/utils/format-result.util';
@@ -56,10 +57,21 @@ export class GraphqlQueryFindDuplicatesResolverService
       objectMetadataItemWithFieldMaps.nameSingular,
     );
 
+    const objectMetadataItemWithFieldsMaps =
+      getObjectMetadataMapItemByNameSingular(
+        objectMetadataMaps,
+        objectMetadataItemWithFieldMaps.nameSingular,
+      );
+
+    if (!objectMetadataItemWithFieldsMaps) {
+      throw new GraphqlQueryRunnerException(
+        `Object ${objectMetadataItemWithFieldMaps.nameSingular} not found`,
+        GraphqlQueryRunnerExceptionCode.OBJECT_METADATA_NOT_FOUND,
+      );
+    }
+
     const graphqlQueryParser = new GraphqlQueryParser(
-      objectMetadataMaps.byNameSingular[
-        objectMetadataItemWithFieldMaps.nameSingular
-      ].fieldsByName,
+      objectMetadataItemWithFieldsMaps?.fieldsByName,
       objectMetadataMaps,
     );