Contrib: Issue #3253647 by phenaproxima, tedbow: Validate some Composer...

core/modules/auto_updates/auto_updates.services.yml

.../modules/auto_updates/src/Validator/SettingsValidator.php

...ReadinessValidation/PackageManagerReadinessChecksTest.php

.../src/Kernel/ReadinessValidation/SettingsValidatorTest.php

core/modules/package_manager/package_manager.services.yml

core/modules/package_manager/src/ComposerUtility.php

...manager/src/EventSubscriber/ComposerSettingsValidator.php

...anager/tests/src/Kernel/ComposerSettingsValidatorTest.php

...ckage_manager/tests/src/Kernel/DiskSpaceValidatorTest.php

...ackage_manager/tests/src/Kernel/LockFileValidatorTest.php

...ager/tests/src/Kernel/WritableFileSystemValidatorTest.php