Issue #3257849 by tedbow: Various core quality updates

automatic_updates.info.yml

automatic_updates.install

automatic_updates.module

automatic_updates.routing.yml

package_manager/package_manager.info.yml

package_manager/src/ComposerUtility.php

package_manager/src/Event/PostDestroyEvent.php

package_manager/src/Event/PostRequireEvent.php

package_manager/src/Event/PreDestroyEvent.php

package_manager/src/Event/PreOperationStageEvent.php

package_manager/src/Event/PreRequireEvent.php

package_manager/src/FileSyncerFactory.php

package_manager/src/ProcessFactory.php

package_manager/src/Stage.php

...age_manager/src/Validator/ComposerExecutableValidator.php

package_manager/src/Validator/DiskSpaceValidator.php

package_manager/src/Validator/LockFileValidator.php

src/Event/ReadinessCheckEvent.php