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-front/src/modules/page-layout/components/PageLayoutInitializationQueryEffect.tsx

@@ -1,5 +1,4 @@
 import { useBasePageLayout } from '@/page-layout/hooks/useBasePageLayout';
-import { usePageLayoutWithRelationWidgets } from '@/page-layout/hooks/usePageLayoutWithRelationWidgets';
 import { useSetIsPageLayoutInEditMode } from '@/page-layout/hooks/useSetIsPageLayoutInEditMode';
 import { pageLayoutCurrentLayoutsComponentState } from '@/page-layout/states/pageLayoutCurrentLayoutsComponentState';
 import { pageLayoutDraftComponentState } from '@/page-layout/states/pageLayoutDraftComponentState';
@@ -8,27 +7,24 @@ import { pageLayoutPersistedComponentState } from '@/page-layout/states/pageLayo
 import { type PageLayout } from '@/page-layout/types/PageLayout';
 import { convertPageLayoutToTabLayouts } from '@/page-layout/utils/convertPageLayoutToTabLayouts';
 import { isPageLayoutEmpty } from '@/page-layout/utils/isPageLayoutEmpty';
-import { useLayoutRenderingContext } from '@/ui/layout/contexts/LayoutRenderingContext';
 import { useAtomComponentState } from '@/ui/utilities/state/jotai/hooks/useAtomComponentState';
 import { useAtomComponentStateCallbackState } from '@/ui/utilities/state/jotai/hooks/useAtomComponentStateCallbackState';
-import { useFeatureFlagsMap } from '@/workspace/hooks/useFeatureFlagsMap';
 import { useStore } from 'jotai';
 import { useCallback, useEffect } from 'react';
 import { isDefined } from 'twenty-shared/utils';
-import { FeatureFlagKey, PageLayoutType } from '~/generated-metadata/graphql';
+import { PageLayoutType } from '~/generated-metadata/graphql';
 import { isDeeplyEqual } from '~/utils/isDeeplyEqual';
 
 type PageLayoutInitializationQueryEffectProps = {
   pageLayoutId: string;
 };
 
-const PageLayoutInitializationEffect = ({
+// oxlint-disable-next-line twenty/effect-components
+export const PageLayoutInitializationQueryEffect = ({
   pageLayoutId,
-  pageLayout,
-}: {
-  pageLayoutId: string;
-  pageLayout: PageLayout | undefined;
-}) => {
+}: PageLayoutInitializationQueryEffectProps) => {
+  const pageLayout = useBasePageLayout(pageLayoutId);
+
   const [pageLayoutIsInitialized, setPageLayoutIsInitialized] =
     useAtomComponentState(pageLayoutIsInitializedComponentState);
 
@@ -99,53 +95,3 @@ const PageLayoutInitializationEffect = ({
 
   return null;
 };
-
-const PageLayoutInitializationWithRelationWidgets = ({
-  pageLayoutId,
-  basePageLayout,
-}: {
-  pageLayoutId: string;
-  basePageLayout: PageLayout | undefined;
-}) => {
-  const pageLayout = usePageLayoutWithRelationWidgets(basePageLayout);
-
-  return (
-    <PageLayoutInitializationEffect
-      pageLayoutId={pageLayoutId}
-      pageLayout={pageLayout}
-    />
-  );
-};
-
-// oxlint-disable-next-line twenty/effect-components
-export const PageLayoutInitializationQueryEffect = ({
-  pageLayoutId,
-}: PageLayoutInitializationQueryEffectProps) => {
-  const { layoutType } = useLayoutRenderingContext();
-
-  const featureFlags = useFeatureFlagsMap();
-  const isRecordPageLayoutEditingEnabled =
-    featureFlags[FeatureFlagKey.IS_RECORD_PAGE_LAYOUT_EDITING_ENABLED];
-
-  const basePageLayout = useBasePageLayout(pageLayoutId);
-
-  const needsRelationWidgets =
-    layoutType === PageLayoutType.RECORD_PAGE &&
-    !isRecordPageLayoutEditingEnabled;
-
-  if (needsRelationWidgets) {
-    return (
-      <PageLayoutInitializationWithRelationWidgets
-        pageLayoutId={pageLayoutId}
-        basePageLayout={basePageLayout}
-      />
-    );
-  }
-
-  return (
-    <PageLayoutInitializationEffect
-      pageLayoutId={pageLayoutId}
-      pageLayout={basePageLayout}
-    />
-  );
-};