fix(intellij): IdeProtocalClient handleMessage subprocess

[nangua]

Description

Logs output:

Unknown message type: subprocess

Checklist

• The relevant docs, if any, have been updated or created
• The relevant tests, if any, have been updated or created

Screenshots

Not involved.

Testing instructions

Not involved.

[netlify]

✅ Deploy Preview for continuedev canceled.

Name	Link
🔨 Latest commit	c2a21a5
🔍 Latest deploy log	https://app.netlify.com/sites/continuedev/deploys/67cfbbeb8a294300092417ef

[sestinj]

@nangua I think we are going to probably deprecate this message soon along with config.ts. I assume you are using config.ts, but could you share what your use case is for "subprocess"?