Issue #3359727 by phenaproxima, tedbow: Add new setting for how unattended updates will be run

automatic_updates.install

automatic_updates.module

config/install/automatic_updates.settings.yml

config/schema/automatic_updates.schema.yml

src/Commands/AutomaticUpdatesCommands.php

src/CronUpdateStage.php

src/Validation/AdminStatusCheckMessages.php

src/Validation/StatusCheckRequirements.php

src/Validation/StatusChecker.php

...atic_updates_test_cron/automatic_updates_test_cron.module

tests/src/Build/UpdateTestBase.php

tests/src/Functional/AutomaticUpdatesFunctionalTestBase.php

tests/src/Functional/StatusCheckTest.php

tests/src/Kernel/AutomaticUpdatesKernelTestBase.php

tests/src/Kernel/CronUpdateStageTest.php

tests/src/Kernel/HookCronTest.php

tests/src/Kernel/StatusCheck/CronFrequencyValidatorTest.php

tests/src/Kernel/StatusCheck/CronServerValidatorTest.php

tests/src/Kernel/StatusCheck/PhpExtensionsValidatorTest.php

tests/src/Kernel/StatusCheck/StatusCheckFailureEmailTest.php