[Refactor][OutputProcessor 2/8]: OmniRequestOutput should inherit RequestOutput and no nested wrap-up (#5146)

Signed-off-by: Boao Shi <aoibosh@connect.hku.hk>
Signed-off-by: bowieshi <aoibosh@connect.hku.hk>
Signed-off-by: princepride <wangzhipeng628@gmail.com>
Signed-off-by: R2-Y <ruiruyang2@gmail.com>
Signed-off-by: amy-why-3459 <wuhaiyan17@huawei.com>
Signed-off-by: Shi Boao Bowie <aoibosh@connect.hku.hk>
Co-authored-by: 汪志鹏 <wangzhipeng628@gmail.com>
Co-authored-by: ruirui(rein) yang <73573651+R2-Y@users.noreply.github.com>
Co-authored-by: amy-why-3459 <wuhaiyan17@huawei.com>
Co-authored-by: Gao Han <hgaoaf@connect.ust.hk>
Co-authored-by: Hongsheng Liu <liuhongsheng4@huawei.com>

tests/diffusion/quantization/test_gguf_diffusion.py

@@ -94,8 +94,8 @@ def _generate_single_stage_image(
     if hasattr(first_output, "images") and first_output.images:
         images = first_output.images
     else:
-        assert hasattr(first_output, "request_output") and first_output.request_output
-        request_output = first_output.request_output
+        assert isinstance(first_output, OmniRequestOutput) and first_output
+        request_output = first_output
         if isinstance(request_output, list):
             req_out = request_output[0]
         else: