fix(pool): don't teardown the communication channel too soon if something is running after the test

[sheremet-va]

Description

Resolves #8766

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[AriPerkkio]

This is now leaking birpc listeners:

(node:45742) MaxListenersExceededWarning: Possible EventEmitter memory leak detected. 11 message listeners added to [process]. MaxListeners is 10. Use emitter.setMaxListeners() to increase limit
    at genericNodeError (node:internal/errors:983:15)
    at wrappedFn (node:internal/errors:537:14)
    at _addListener (node:events:592:17)
    at process.addListener (node:events:610:10)
    at on (file:///x/Git/ast-v8-to-istanbul/node_modules/.pnpm/[email protected]_@[email protected][email protected][email protected]/node_modules/vitest/dist/chunks/init-forks.WglB-sfY.js:15:7)
    at createBirpc (file:///x/Git/ast-v8-to-istanbul/node_modules/.pnpm/[email protected]_@[email protected][email protected][email protected]/node_modules/vitest/dist/chunks/index.Bgo3tNWt.js:164:14)
    at createRuntimeRpc (file:///x/Git/ast-v8-to-istanbul/node_modules/.pnpm/[email protected]_@[email protected][email protected][email protected]/node_modules/vitest/dist/chunks/rpc.cD77ENhU.js:31:22)

[sheremet-va]

This is now leaking birpc listeners:

We need to clean it up before running the next test, like it was in v3.