Create Dashboard Workspace Entity (#14112)

Closes https://github.com/twentyhq/core-team-issues/issues/1392

- Added a workspace gate on the entity for the feature flag
`IS_PAGE_LAYOUT_ENABLED`

packages/twenty-server/src/engine/workspace-manager/workspace-manager.service.ts

@@ -137,6 +137,7 @@ export class WorkspaceManagerService {
       mainDataSource,
       dataSourceMetadata.schema,
       createdObjectMetadata,
+      featureFlags,
     );
 
     if (featureFlags[FeatureFlagKey.IS_CORE_VIEW_SYNCING_ENABLED]) {
@@ -146,6 +147,7 @@ export class WorkspaceManagerService {
         mainDataSource,
         workspaceId,
         createdObjectMetadata,
+        featureFlags,
       );
     }
   }