[Refactor] Consolidate sequence normalization and enc-dec parsing (#33928)

Signed-off-by: DarkLight1337 <tlleungac@connect.ust.hk>

vllm/v1/engine/utils.py

@@ -17,8 +17,6 @@ import zmq
 
 from vllm import envs
 from vllm.config import CacheConfig, ParallelConfig, VllmConfig
-from vllm.inputs import PromptType
-from vllm.inputs.parse import get_prompt_components
 from vllm.logger import init_logger
 from vllm.platforms import current_platform
 from vllm.ray.ray_env import get_env_vars_to_copy
@@ -226,10 +224,6 @@ def get_device_indices(
     return value
 
 
-def get_prompt_text(prompt: PromptType) -> str | None:
-    return get_prompt_components(prompt)[0]
-
-
 class CoreEngineActorManager:
     """
     Utility class to handle creation, readiness, and shutdown