[Core][Refactor][Diffusion] refactor request scheduler's admission wait policy (#5843)

Signed-off-by: Huang, Zeyu <11222265+fhfuih@users.noreply.github.com>
Co-authored-by: Hongsheng Liu <liuhongsheng4@huawei.com>

tools/pre_commit/check_tts_adapter.py

@@ -31,8 +31,8 @@ SERVING_SPEECH = Path("vllm_omni/entrypoints/openai/serving_speech.py")
 ADAPTERS_INIT = Path("vllm_omni/entrypoints/openai/tts_adapters/__init__.py")
 
 # Budgets. These may only go DOWN. See the module docstring.
-MAX_MODEL_TYPE_BRANCHES = 29
-MAX_LEGACY_DETECTORS = 1
+MAX_MODEL_TYPE_BRANCHES = 27
+MAX_LEGACY_DETECTORS = 0
 
 _GUIDANCE = """
 Move the per-model behaviour into its adapter under