fix(@angular-devkit/build-angular): reduce the number of max workers to available CPUs minus one

This commit reduces the maximum number of workers to the available CPUs minus 1. This adjustment ensures that some resources are left for the main thread, preventing it from being starved of CPU cycles.

(cherry picked from commit 164c0d8)

Author: alan-agius4

packages/angular_devkit/build_angular/src/utils/environment-options.ts

@@ -78,7 +78,7 @@ export const allowMinify = debugOptimize.minify;
 const maxWorkersVariable = process.env['NG_BUILD_MAX_WORKERS'];
 export const maxWorkers = isPresent(maxWorkersVariable)
   ? +maxWorkersVariable
-  : Math.min(4, availableParallelism());
+  : Math.min(4, Math.max(availableParallelism() - 1, 1));
 
 const parallelTsVariable = process.env['NG_BUILD_PARALLEL_TS'];
 export const useParallelTs = !isPresent(parallelTsVariable) || !isDisabled(parallelTsVariable);