chore(editor): remove feature flag of embed doc with alias (#12620)

<!-- This is an auto-generated comment: release notes by coderabbit.ai -->

## Summary by CodeRabbit

- **New Features**
  - Toolbar actions related to embedding and duplicating documents are now always available without restrictions.

- **Chores**
  - Removed the feature flag controlling embed document alias features for a simpler user experience.

- **Tests**
  - Updated test setup to remove reliance on the deprecated feature flag.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/frontend/core/src/modules/dnd/index.ts

@@ -2,17 +2,11 @@ import { type Framework } from '@toeverything/infra';
 
 import { DocsService } from '../doc';
 import { EditorSettingService } from '../editor-setting';
-import { FeatureFlagService } from '../feature-flag';
 import { WorkspaceScope, WorkspaceService } from '../workspace';
 import { DndService } from './services';
 
 export function configureDndModule(framework: Framework) {
   framework
     .scope(WorkspaceScope)
-    .service(DndService, [
-      DocsService,
-      WorkspaceService,
-      EditorSettingService,
-      FeatureFlagService,
-    ]);
+    .service(DndService, [DocsService, WorkspaceService, EditorSettingService]);
 }

packages/frontend/core/src/modules/dnd/services/index.ts

@@ -18,7 +18,6 @@ import { Service } from '@toeverything/infra';
 
 import type { DocsService } from '../../doc';
 import type { EditorSettingService } from '../../editor-setting';
-import type { FeatureFlagService } from '../../feature-flag';
 import { resolveLinkToDoc } from '../../navigation';
 import type { WorkspaceService } from '../../workspace';
 
@@ -35,8 +34,7 @@ export class DndService extends Service {
   constructor(
     private readonly docsService: DocsService,
     private readonly workspaceService: WorkspaceService,
-    private readonly editorSettingService: EditorSettingService,
-    private readonly featureFlagService: FeatureFlagService
+    private readonly editorSettingService: EditorSettingService
   ) {
     super();
 
@@ -186,9 +184,7 @@ export class DndService extends Service {
           return false;
         },
         onDropTargetChange: (args: MonitorDragEvent<MixedDNDData>) => {
-          if (this.featureFlagService.flags.enable_embed_doc_with_alias.value) {
-            changeDocCardView(args);
-          }
+          changeDocCardView(args);
         },
       })
     );

packages/frontend/core/src/modules/feature-flag/constant.ts

@@ -259,15 +259,6 @@ export const AFFINE_FLAGS = {
     configurable: isCanaryBuild,
     defaultState: false,
   },
-  // TODO(@L-Sun): remove this flag after the feature is released
-  enable_embed_doc_with_alias: {
-    category: 'blocksuite',
-    bsFlag: 'enable_embed_doc_with_alias',
-    displayName: 'Embed doc with alias',
-    description: 'Embed doc with alias',
-    configurable: isCanaryBuild,
-    defaultState: isCanaryBuild,
-  },
   enable_setting_subpage_animation: {
     category: 'affine',
     displayName: 'Enable Setting Subpage Animation',