[Fix] display current object label in morph relation picker after rename 2/2 (#17484)

Following https://github.com/twentyhq/twenty/pull/17209

The goal is to display the updated label. For
SingleRecordPickerMenuItemsWithSearch, we did it in two parts to avoid
the breaking change by calling `objectLabelSingular` after its addition
has been deployed to prod
<img width="410" height="295" alt="image"
src="https://github.com/user-attachments/assets/d6014391-b943-4fdb-a15f-e62717463d74"
/>

packages/twenty-front/src/modules/object-record/record-picker/single-record-picker/components/SingleRecordPickerMenuItem.tsx

@@ -85,7 +85,7 @@ export const SingleRecordPickerMenuItem = ({
         }
         contextualText={
           showObjectName
-            ? capitalize(searchRecord.objectNameSingular)
+            ? capitalize(searchRecord.objectLabelSingular)
             : undefined
         }
       />

packages/twenty-server/src/engine/core-modules/search/services/search.service.ts

@@ -453,7 +453,9 @@ export class SearchService {
           return {
             recordId: record.id,
             objectNameSingular: objectMetadataItem.nameSingular,
-            objectLabelSingular: objectMetadataItem.labelSingular,
+            objectLabelSingular:
+              objectMetadataItem.standardOverrides?.labelSingular ??
+              objectMetadataItem.labelSingular,
             label: this.getLabelIdentifierValue(
               record,
               objectMetadataItem,