### What this PR does / why we need it?
The variable ’is_deepseek_v3_r1‘ now is useless in the repository, so
delete it now. And the funciton 'get_fused_moe_state' is used only for
torchair, so it need to be deleted along with torchair
### Does this PR introduce _any_ user-facing change?
No
### How was this patch tested?
- vLLM version: v0.12.0
- vLLM main:
ad32e3e19c
Signed-off-by: hust17yixuan <303660421@qq.com>