refactor: convert activity stub to a factory (#16702)

server/test/fixtures/activity.stub.ts

@@ -1,42 +0,0 @@
-import { ActivityItem } from 'src/types';
-import { albumStub } from 'test/fixtures/album.stub';
-import { assetStub } from 'test/fixtures/asset.stub';
-
-export const activityStub = {
-  oneComment: Object.freeze<ActivityItem>({
-    id: 'activity-1',
-    comment: 'comment',
-    isLiked: false,
-    userId: 'admin_id',
-    user: {
-      id: 'admin_id',
-      name: 'admin',
-      email: 'admin@test.com',
-      profileImagePath: '',
-      profileChangedAt: new Date('2021-01-01'),
-    },
-    assetId: assetStub.image.id,
-    albumId: albumStub.oneAsset.id,
-    createdAt: new Date(),
-    updatedAt: new Date(),
-    updateId: 'uuid-v7',
-  }),
-  liked: Object.freeze<ActivityItem>({
-    id: 'activity-2',
-    comment: null,
-    isLiked: true,
-    userId: 'admin_id',
-    user: {
-      id: 'admin_id',
-      name: 'admin',
-      email: 'admin@test.com',
-      profileImagePath: '',
-      profileChangedAt: new Date('2021-01-01'),
-    },
-    assetId: assetStub.image.id,
-    albumId: albumStub.oneAsset.id,
-    createdAt: new Date(),
-    updatedAt: new Date(),
-    updateId: 'uuid-v7',
-  }),
-};