fixing #2993576

Orkut Murat Yılmazrequested to merge
issue/db_maintenance-2993576:2993576-cleanup-config-and into 3.0.x
  • config/install/db_maintenance.settings.yml — removed cron_last_run, all_tables/write_log → false, added table_list: { }
    • config/schema/db_maintenance.schema.yml — config_object type, removed cron_last_run, fixed bool types, added nested table_list sequence
    • src/Form/DbMaintenanceAdminSettings.php — removed Element import (kept CsrfTokenGenerator + ContainerInterface for DI), submitForm uses cleanValues(), buildForm uses nested table_list[db]
    • src/Module/Config/ConfigHandler.php — cron_last_run → State API, table_list_ → table_list.
    • db_maintenance.post_update.php (new file) — db_maintenance_post_update_cleanup_config migrates old flat keys

Closes #2993576

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