Revert "fix(@angular-devkit/benchmark): Allows the CLI repo to be hosted in a directory with spaces. (angular#16073)"

This reverts commit 217eb29.

Reverting as this is breaking some Windows/CI builds. See angular#16119.

Author: dgp1130

packages/angular_devkit/benchmark/src/monitored-process.ts

@@ -37,7 +37,7 @@ export class LocalMonitoredProcess implements MonitoredProcess {
   run(): Observable<number> {
     return new Observable(obs => {
       const { cmd, cwd, args } = this.command;
-      const spawnOptions: SpawnOptions = { cwd };
+      const spawnOptions: SpawnOptions = { cwd: cwd, shell: true };
 
       // Spawn the process.
       const childProcess = spawn(cmd, args, spawnOptions);