feat(Core/Arena): Add support for arena seasons completion with progression in runtime. (#19858)

Co-authored-by: Winfidonarleyan <dowlandtop@yandex.com>

data/sql/updates/pending_db_characters/active_arena_season.sql

@@ -0,0 +1,10 @@
+DROP TABLE IF EXISTS `active_arena_season`;
+CREATE TABLE `active_arena_season` (
+    `season_id` TINYINT UNSIGNED NOT NULL,
+    `season_state` TINYINT UNSIGNED NOT NULL COMMENT 'Supported 2 states: 0 - disabled; 1 - in progress.'
+)
+CHARSET = utf8mb4
+COLLATE = utf8mb4_unicode_ci
+ENGINE = InnoDB;
+
+INSERT INTO `active_arena_season` (`season_id`, `season_state`) VALUES (8, 1);