chore(page-layout): remove IS_RECORD_PAGE_LAYOUT_* feature flags (#20556)

## Summary

- Both \`IS_RECORD_PAGE_LAYOUT_EDITING_ENABLED\` and
\`IS_RECORD_PAGE_LAYOUT_GLOBAL_EDITION_ENABLED\` are force-enabled on
every existing workspace by the 1.23.0 upgrade command
\`BackfillRecordPageLayoutsCommand\` and seeded enabled for new
workspaces via \`DEFAULT_FEATURE_FLAGS\` +
\`seed-feature-flags.util.ts\`. They are no longer load-bearing.
- Unwrap all \`if (flag) { … }\` conditionals to their enabled branch on
both server and front.
- Delete legacy fallback files that only the disabled branch reached:
\`PageLayoutRelationWidgetsSyncEffect\`,
\`usePageLayoutWithRelationWidgets\`,
\`reInjectDynamicRelationWidgetsFromDraft\`,
\`injectRelationWidgetsIntoLayout\`, \`isDynamicRelationWidget\` (and
their tests).
- Strip the two \`enableFeatureFlags\` calls from the 1.23 upgrade
command — the page-layout backfill data logic itself is kept intact
since old workspaces upgrading from < 1.23 still need it.
- No DB cleanup migration: stale \`featureFlag\` rows are left in place,
matching the precedent set by #20531 and #20460.

Net diff: 37 files, +106 / -1727.

## Test plan

- [x] \`npx nx typecheck twenty-shared twenty-server twenty-front\` —
all pass
- [x] \`npx nx lint:diff-with-main twenty-server twenty-front\` — all
pass
- [x] \`cd packages/twenty-front && npx jest page-layout\` — 1240 tests,
all pass
- [x] \`cd packages/twenty-server && npx jest
workspace-entity-manager.spec\` — pass
- [ ] Manual smoke: open a record page, verify tabs render and \"Edit
Layout\" command-menu action is available
- [ ] Manual smoke: Settings → Data model → object → Layout tab is
visible (and hidden for remote / Dashboard objects)
- [ ] Manual smoke: edit a tab title, save, reload — confirm persistence

packages/twenty-server/src/engine/workspace-manager/dev-seeder/core/utils/seed-feature-flags.util.ts

@@ -50,16 +50,6 @@ export const seedFeatureFlags = async ({
         workspaceId: workspaceId,
         value: true,
       },
-      {
-        key: FeatureFlagKey.IS_RECORD_PAGE_LAYOUT_EDITING_ENABLED,
-        workspaceId: workspaceId,
-        value: true,
-      },
-      {
-        key: FeatureFlagKey.IS_RECORD_PAGE_LAYOUT_GLOBAL_EDITION_ENABLED,
-        workspaceId: workspaceId,
-        value: true,
-      },
     ])
     .execute();
 };

packages/twenty-server/src/engine/workspace-manager/twenty-standard-application/constants/standard-command-menu-item.constant.ts

@@ -264,7 +264,7 @@ export const STANDARD_COMMAND_MENU_ITEMS = {
     shortLabel: 'Edit Layout',
     availabilityType: CommandMenuItemAvailabilityType.RECORD_SELECTION,
     conditionalAvailabilityExpression:
-      'pageType == "RECORD_PAGE" and featureFlags.IS_RECORD_PAGE_LAYOUT_EDITING_ENABLED and not isLayoutCustomizationModeEnabled and noneDefined(selectedRecords, "deletedAt") and objectPermissions.canUpdateObjectRecords and objectMetadataItem.nameSingular != "dashboard"',
+      'pageType == "RECORD_PAGE" and not isLayoutCustomizationModeEnabled and noneDefined(selectedRecords, "deletedAt") and objectPermissions.canUpdateObjectRecords and objectMetadataItem.nameSingular != "dashboard"',
     availabilityObjectMetadataUniversalIdentifier: null,
     frontComponentUniversalIdentifier: null,
     engineComponentKey: EngineComponentKey.EDIT_RECORD_PAGE_LAYOUT,

packages/twenty-server/src/engine/workspace-manager/workspace-migration/constant/default-feature-flags.ts

@@ -1,7 +1,5 @@
 import { FeatureFlagKey } from 'twenty-shared/types';
 
 export const DEFAULT_FEATURE_FLAGS = [
-  FeatureFlagKey.IS_RECORD_PAGE_LAYOUT_GLOBAL_EDITION_ENABLED,
-  FeatureFlagKey.IS_RECORD_PAGE_LAYOUT_EDITING_ENABLED,
   FeatureFlagKey.IS_REST_METADATA_API_NEW_FORMAT_DIRECT,
 ] as const satisfies FeatureFlagKey[];