[CI]Add transformers_utils to Async Engine, Inputs, Utils, Worker Test (#24615)

Signed-off-by: Xingyu Liu <charlotteliu12x@gmail.com>

.buildkite/test-pipeline.yaml

@@ -54,6 +54,7 @@ steps:
   - tests/utils_
   - tests/worker
   - tests/standalone_tests/lazy_imports.py
+  - tests/transformers_utils
   commands:
   - python3 standalone_tests/lazy_imports.py
   - pytest -v -s mq_llm_engine # MQLLMEngine
@@ -63,6 +64,7 @@ steps:
   - pytest -v -s multimodal
   - pytest -v -s utils_ # Utils
   - pytest -v -s worker # Worker
+  - pytest -v -s transformers_utils # transformers_utils
 
 - label: Python-only Installation Test # 10min
   timeout_in_minutes: 20