[Bugfix]delele profile_run in model_runner (#5122)

### What this PR does / why we need it?
delete sekf.in_profile_run in model_runner to make EPLB works as expect
### 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: zhenwenqi2024 <zhenwenqi_2022@qq.com>
Signed-off-by: Mengqing Cao <cmq0113@163.com>
Co-authored-by: Mengqing Cao <cmq0113@163.com>

tests/ut/spec_decode/test_mtp_proposer.py

@@ -65,7 +65,6 @@ class TestMtpProposer:
         runner.max_num_reqs = 256
         runner._use_aclgraph.return_value = False
         runner.reserved_mc2_mask = None
-        runner.in_profile_run = False
         return runner
 
     @patch("vllm_ascend.spec_decode.mtp_proposer.CpuGpuBuffer")