[CI/Build] Fix nested group breaking nightly pipeline upload (#5572)

Signed-off-by: wangyu <410167048@qq.com>

.buildkite/cuda/test-nightly.yml

@@ -455,24 +455,26 @@ steps:
         mirror_hardwares: h100_2
 
   - group: ":card_index_dividers: Diffusion Test"
+    key: nightly-diffusion-test-group
     depends_on: upload-nightly-pipeline
     if: build.env("NIGHTLY") == "1" || build.pull_request.labels includes "nightly-test" || build.pull_request.labels includes "diffusion-x2iat-test"
     steps:
-      - group: ":full_moon: Diffusion · Distributed Test"
-        timeout_in_minutes: 30
+      - label: ":full_moon: Diffusion · Distributed Test"
+        timeout_in_minutes: 60
         commands:
-          - timeout 30m pytest -sv tests/diffusion/distributed/ -m 'full_model and cuda' --run-level "full_model"
+          - pytest -sv tests/diffusion/distributed/ -m 'full_model and cuda' --run-level "full_model"
         mirror_hardwares: l4_4
 
       - label: ":full_moon: Diffusion · Offloader Test"
-        timeout_in_minutes: 40
+        timeout_in_minutes: 60
         commands:
-          - timeout 40m pytest -s -v tests/diffusion/offloader -m "full_model and cuda"
+          - pytest -sv tests/diffusion/offloader -m "full_model and cuda"
         mirror_hardwares: l4_1
 
       - label: ":full_moon: Diffusion · Quantization Test with H100"
+        timeout_in_minutes: 60
         commands:
-          - timeout 60m pytest -sv tests/diffusion/quantization -m 'full_model and cuda and H100' --run-level "full_model"
+          - pytest -sv tests/diffusion/quantization -m 'full_model and cuda and H100' --run-level "full_model"
         mirror_hardwares: h100_1
 
       - label: ":full_moon: Diffusion · Quantization Test with L4"
@@ -482,15 +484,6 @@ steps:
           - pytest -sv tests/diffusion/quantization -m 'full_model and cuda and L4' --run-level "full_model"
         mirror_hardwares: l4_1
 
-      - label: ":full_moon: Diffusion · Wan VAE Spatial Shard Correctness Test"
-        timeout_in_minutes: 60
-        commands:
-          - >-
-            pytest -sv tests/diffusion/distributed/test_wan_spatial_shard.py
-            -m "full_model and diffusion and H100 and distributed_cuda"
-            --run-level "full_model"
-        mirror_hardwares: h100_2
-
   - label: ":bar_chart: Testcase Statistics"
     key: nightly-testcase-statistics
     timeout_in_minutes: 120