Issue #3230250: Update Composer Stager to 0.2.0

src/ComposerStager/Beginner.php

-<?php
-
-namespace Drupal\automatic_updates\ComposerStager;
-
-use PhpTuf\ComposerStager\Domain\BeginnerInterface;
-use PhpTuf\ComposerStager\Domain\Output\ProcessOutputCallbackInterface;
-use PhpTuf\ComposerStager\Exception\DirectoryAlreadyExistsException;
-use PhpTuf\ComposerStager\Exception\DirectoryNotFoundException;
-use PhpTuf\ComposerStager\Infrastructure\Filesystem\FilesystemInterface;
-use PhpTuf\ComposerStager\Infrastructure\Process\FileCopier\FileCopierInterface;
-
-/**
- * An implementation of Composer Stager's Beginner which supports exclusions.
- *
- * @todo Remove this class when composer_stager implements this functionality.
- */
-final class Beginner implements BeginnerInterface {
-
-  /**
-   * The file copier service.
-   *
-   * @var \PhpTuf\ComposerStager\Infrastructure\Process\FileCopier\FileCopierInterface
-   */
-  private $fileCopier;
-
-  /**
-   * The file system service.
-   *
-   * @var \PhpTuf\ComposerStager\Infrastructure\Filesystem\FilesystemInterface
-   */
-  private $filesystem;
-
-  /**
-   * Constructs a Beginner object.
-   *
-   * @param \PhpTuf\ComposerStager\Infrastructure\Process\FileCopier\FileCopierInterface $fileCopier
-   *   The file copier service.
-   * @param \PhpTuf\ComposerStager\Infrastructure\Filesystem\FilesystemInterface $filesystem
-   *   The file system service.
-   */
-  public function __construct(FileCopierInterface $fileCopier, FilesystemInterface $filesystem) {
-    $this->fileCopier = $fileCopier;
-    $this->filesystem = $filesystem;
-  }
-
-  /**
-   * {@inheritdoc}
-   */
-  public function begin(string $activeDir, string $stagingDir, ?ProcessOutputCallbackInterface $callback = NULL, ?int $timeout = 120, array $exclusions = []): void {
-    if (!$this->filesystem->exists($activeDir)) {
-      throw new DirectoryNotFoundException($activeDir, 'The active directory does not exist at "%s"');
-    }
-
-    if ($this->filesystem->exists($stagingDir)) {
-      throw new DirectoryAlreadyExistsException($stagingDir, 'The staging directory already exists at "%s"');
-    }
-
-    $this->fileCopier->copy(
-          $activeDir,
-          $stagingDir,
-          $exclusions,
-          $callback,
-          $timeout
-      );
-  }
-
-}