[New model] Qwen-Image-2.1 support (rebase + review follow-ups) (#8099)

Signed-off-by: NumberWan <wantszkin2003@gmail.com>
Signed-off-by: SamitHuang <285365963@qq.com>
Signed-off-by: Samit <285365963@qq.com>
Co-authored-by: Isotr0py <Isotr0py@outlook.com>
Co-authored-by: Tianyu Guo <guoty9@mail2.sysu.edu.cn>
Co-authored-by: Cursor <cursoragent@cursor.com>
Co-authored-by: SamitHuang <285365963@qq.com>
Co-authored-by: Gao Han <hgaoaf@connect.ust.hk>

tests/model_tests/diffusion/test_alignment.py

@@ -25,6 +25,9 @@ pytestmark = [pytest.mark.diffusion, pytest.mark.cpu, pytest.mark.core_model]
 # for adding a new tiny model builder and corresponding entry in DIFFUSION_TEST_SETTINGS.
 EXCLUDED_MODELS = [
     "QwenImageLayeredPipeline",
+    # Dedicated CPU/unit coverage in tests/diffusion/models/qwen_image_21/.
+    # Tiny-model offline suite is not wired yet (2.1 transformer/VAE configs).
+    "QwenImage21Pipeline",
     "GlmImagePipeline",
     "ZImagePipeline",
     "OvisImagePipeline",