Activity as standard object (#6219)

In this PR I layout the first steps to migrate Activity to a traditional
Standard objects

Since this is a big transition, I'd rather split it into several
deployments / PRs

<img width="1512" alt="image"
src="https://github.com/user-attachments/assets/012e2bbf-9d1b-4723-aaf6-269ef588b050">

---------

Co-authored-by: Charles Bochet <charles@twenty.com>
Co-authored-by: bosiraphael <71827178+bosiraphael@users.noreply.github.com>
Co-authored-by: Weiko <corentin@twenty.com>
Co-authored-by: Faisal-imtiyaz123 <142205282+Faisal-imtiyaz123@users.noreply.github.com>
Co-authored-by: Prateek Jain <prateekj1171998@gmail.com>

packages/twenty-front/src/modules/object-metadata/utils/isLabelIdentifierField.ts

@@ -13,7 +13,8 @@ export const isLabelIdentifierField = ({
     ObjectMetadataItem,
     'labelIdentifierFieldMetadataId'
   >;
-}) =>
-  isDefined(objectMetadataItem.labelIdentifierFieldMetadataId)
+}) => {
+  return isDefined(objectMetadataItem.labelIdentifierFieldMetadataId)
     ? fieldMetadataItem.id === objectMetadataItem.labelIdentifierFieldMetadataId
     : fieldMetadataItem.name === DEFAULT_LABEL_IDENTIFIER_FIELD_NAME;
+};