fix: implement existing withStacked on searchAssetBuilder (#26607)

Co-authored-by: Joe <code@joebabbitt.com>

server/test/medium/specs/services/search.service.spec.ts

@@ -88,4 +88,24 @@ describe(SearchService.name, () => {
       expect(result).toEqual({ total: 0 });
     });
   });
+
+  describe('withStacked option', () => {
+    it('should exclude stacked assets when withStacked is false', async () => {
+      const { sut, ctx } = setup();
+      const { user } = await ctx.newUser();
+
+      const { asset: primaryAsset } = await ctx.newAsset({ ownerId: user.id });
+      const { asset: stackedAsset } = await ctx.newAsset({ ownerId: user.id });
+      const { asset: unstackedAsset } = await ctx.newAsset({ ownerId: user.id });
+
+      await ctx.newStack({ ownerId: user.id }, [primaryAsset.id, stackedAsset.id]);
+
+      const auth = factory.auth({ user: { id: user.id } });
+
+      const response = await sut.searchMetadata(auth, { withStacked: false });
+
+      expect(response.assets.items.length).toBe(1);
+      expect(response.assets.items[0].id).toBe(unstackedAsset.id);
+    });
+  });
 });