tiflash_compute node is treated as tikv in dashboard profiling page

## Bug Report

Please answer these questions before submitting your issue. Thanks!

### 1. Minimal reproduce step (Required)
1. Deploy cluster in disaggregated-tiflash mode(check [example config topo](https://github.com/guo-shaoge/tiflash/blob/disaggregated_tiflash_deploy/etc/disaggregated_tiflash.yaml))
1.1. Set tidb.toml disaggregated-tiflash as true.
1.2. Set tiflash config: flash.disaggregated_mode as tiflash_compute or tiflash_storage
2. Check `ip:port/dashboard/#/instance_profiling`, you can see tiflash_compute is treated as tikv

### 2. What did you expect to see? (Required)
tiflash_compute is treated as tikv
### 3. What did you see instead (Required)
tiflash_compute should not be treated as tikv.
### 4. What is your TiDB version? (Required)
master