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/database/commands/upgrade-version-command/1-23/1-23-workspace-command-1780000001500-backfill-record-page-layouts.command.ts

@@ -1,5 +1,5 @@
 import { Command } from 'nest-commander';
-import { FeatureFlagKey, ViewType } from 'twenty-shared/types';
+import { type FeatureFlagKey, ViewType } from 'twenty-shared/types';
 import { isDefined } from 'twenty-shared/utils';
 
 import { ActiveOrSuspendedWorkspaceCommandRunner } from 'src/database/commands/command-runners/active-or-suspended-workspace.command-runner';
@@ -47,7 +47,7 @@ export class BackfillRecordPageLayoutsCommand extends ActiveOrSuspendedWorkspace
     const isDryRun = options.dryRun ?? false;
 
     const isAlreadyEnabled = await this.featureFlagService.isFeatureEnabled(
-      FeatureFlagKey.IS_RECORD_PAGE_LAYOUT_EDITING_ENABLED,
+      'IS_RECORD_PAGE_LAYOUT_EDITING_ENABLED' as FeatureFlagKey,
       workspaceId,
     );
 
@@ -88,12 +88,12 @@ export class BackfillRecordPageLayoutsCommand extends ActiveOrSuspendedWorkspace
     });
 
     await this.featureFlagService.enableFeatureFlags(
-      [FeatureFlagKey.IS_RECORD_PAGE_LAYOUT_EDITING_ENABLED],
+      ['IS_RECORD_PAGE_LAYOUT_EDITING_ENABLED' as FeatureFlagKey],
       workspaceId,
     );
 
     await this.featureFlagService.enableFeatureFlags(
-      [FeatureFlagKey.IS_RECORD_PAGE_LAYOUT_GLOBAL_EDITION_ENABLED],
+      ['IS_RECORD_PAGE_LAYOUT_GLOBAL_EDITION_ENABLED' as FeatureFlagKey],
       workspaceId,
     );