Issue #2823543 by Dane Powell, dawehner, dhendriks: Make cron execution logging optional

core/lib/Drupal/Core/Cron.php

core/modules/automated_cron/automated_cron.module

...les/config/src/Tests/ConfigInstallProfileOverrideTest.php

...tests/config_override_test/config/install/system.cron.yml

core/modules/dblog/src/Tests/DbLogTest.php

core/modules/system/config/install/system.cron.yml

core/modules/system/config/schema/system.schema.yml

core/modules/system/src/Form/CronForm.php

core/modules/system/system.install

.../src/Kernel/Migrate/d7/MigrateSystemConfigurationTest.php

core/profiles/standard/config/install/system.cron.yml

...s/testing_config_overrides/config/install/system.cron.yml