Hide workflows + remove feature flag from entities (#9768)

From now on workflow entities and views will be seed for every new
workspace. What will prevent user to see those is the feature flag used
in frontend. It will prevent workflow objects to be stored in the recoil
state.

Without feature flag, workflows will:
- remain invisible in metadata
- not be accessible through views or show page
- remain invisible on side menu

packages/twenty-front/src/modules/object-metadata/hooks/useRefreshObjectMetadataItem.ts

@@ -2,10 +2,16 @@ import { FIND_MANY_OBJECT_METADATA_ITEMS } from '@/object-metadata/graphql/queri
 import { useApolloMetadataClient } from '@/object-metadata/hooks/useApolloMetadataClient';
 import { isAppWaitingForFreshObjectMetadataState } from '@/object-metadata/states/isAppWaitingForFreshObjectMetadataState';
 import { objectMetadataItemsState } from '@/object-metadata/states/objectMetadataItemsState';
+import { CoreObjectNameSingular } from '@/object-metadata/types/CoreObjectNameSingular';
 import { ObjectMetadataItem } from '@/object-metadata/types/ObjectMetadataItem';
+import { isWorkflowSubObjectMetadata } from '@/object-metadata/utils/isWorkflowSubObjectMetadata';
 import { mapPaginatedObjectMetadataItemsToObjectMetadataItems } from '@/object-metadata/utils/mapPaginatedObjectMetadataItemsToObjectMetadataItems';
+import { useIsFeatureEnabled } from '@/workspace/hooks/useIsFeatureEnabled';
 import { useRecoilCallback } from 'recoil';
-import { ObjectMetadataItemsQuery } from '~/generated-metadata/graphql';
+import {
+  FeatureFlagKey,
+  ObjectMetadataItemsQuery,
+} from '~/generated-metadata/graphql';
 import { isDeeplyEqual } from '~/utils/isDeeplyEqual';
 
 type FetchPolicy = 'network-only' | 'cache-first';
@@ -14,6 +20,9 @@ export const useRefreshObjectMetadataItems = (
   fetchPolicy: FetchPolicy = 'cache-first',
 ) => {
   const client = useApolloMetadataClient();
+  const isWorkflowEnabled = useIsFeatureEnabled(
+    FeatureFlagKey.IsWorkflowEnabled,
+  );
 
   const refreshObjectMetadataItems = async () => {
     const result = await client.query<ObjectMetadataItemsQuery>({
@@ -27,7 +36,15 @@ export const useRefreshObjectMetadataItems = (
         pagedObjectMetadataItems: result.data,
       });
 
-    replaceObjectMetadataItemIfDifferent(objectMetadataItems);
+    const filteredObjectMetadataItems = objectMetadataItems.filter((object) => {
+      return (
+        isWorkflowEnabled ||
+        (object.nameSingular !== CoreObjectNameSingular.Workflow &&
+          !isWorkflowSubObjectMetadata(object.nameSingular))
+      );
+    });
+
+    replaceObjectMetadataItemIfDifferent(filteredObjectMetadataItems);
   };
 
   const replaceObjectMetadataItemIfDifferent = useRecoilCallback(