refactor(@angular/build): increase piscina idleTimeout to 4s.

Workaround for piscinajs/piscina#816

Addresses
```
    error properties: Object({ generatedMessage: true, code: 'ERR_ASSERTION', actual: 1, expected: 0, operator: 'strictEqual' })
        at Timeout._onTimeout (/home/runner/.cache/bazel/_bazel_runner/f47b8283cc0f5922f9455b06771398a1/sandbox/processwrapper-sandbox/3878/execroot/_main/bazel-out/k8-fastbuild/bin/packages/angular/build/application_integration_tests_/application_integration_tests.runfiles/_main/node_modules/.aspect_rules_js/[email protected]/node_modules/piscina/src/index.ts:447:16)
        at listOnTimeout (node:internal/timers:608:17)
        at processTimers (node:internal/timers:543:7)
```

Author: alan-agius4

packages/angular/build/src/utils/worker-pool.ts

@@ -15,7 +15,7 @@ export class WorkerPool extends Piscina {
   constructor(options: WorkerPoolOptions) {
     const piscinaOptions: WorkerPoolOptions = {
       minThreads: 1,
-      idleTimeout: 1000,
+      idleTimeout: 4_000,
       // Web containers do not support transferable objects with receiveOnMessagePort which
       // is used when the Atomics based wait loop is enable.
       atomics: process.versions.webcontainer ? 'disabled' : 'sync',