[Misc][V0 Deprecation] Remove V0 Worker (#1821)

### What this PR does / why we need it?
Remove V0 worker.

This PR is a part of
#1620.

- vLLM version: v0.9.2
- vLLM main:
vllm-project/vllm@6cbc4d4

Signed-off-by: shen-shanshan <467638484@qq.com>

Author: shen-shanshan