View field override (#18572)

## Context
This PR introduces overrides for view fields which will be useful for
page layout FIELDS widgets fields position/groups/visibility override +
restore logic.

packages/twenty-server/src/engine/core-modules/application/application-manifest/converters/from-view-field-group-manifest-to-universal-flat-view-field-group.util.ts

@@ -20,6 +20,7 @@ export const fromViewFieldGroupManifestToUniversalFlatViewFieldGroup = ({
     name: viewFieldGroupManifest.name ?? '',
     position: viewFieldGroupManifest.position,
     isVisible: viewFieldGroupManifest.isVisible ?? true,
+    overrides: null,
     viewFieldUniversalIdentifiers: [],
     createdAt: now,
     updatedAt: now,

packages/twenty-server/src/engine/core-modules/application/application-manifest/converters/from-view-field-manifest-to-universal-flat-view-field.util.ts

@@ -25,6 +25,7 @@ export const fromViewFieldManifestToUniversalFlatViewField = ({
     size: viewFieldManifest.size ?? 0,
     position: viewFieldManifest.position,
     aggregateOperation: viewFieldManifest.aggregateOperation ?? null,
+    universalOverrides: null,
     createdAt: now,
     updatedAt: now,
     deletedAt: null,