Core/Conversations: Dropped time fields and calculate them using db2 data

Port From (https://github.com/TrinityCore/TrinityCore/commit/94b14e4f6355a7bab8004dcc2ecadadbc52833de)

sql/updates/hotfixes/master/2021_10_26_00_hotfixes.sql

@@ -0,0 +1,15 @@
+--
+-- Table structure for table `broadcast_text_duration`
+--
+DROP TABLE IF EXISTS `broadcast_text_duration`;
+/*!40101 SET @saved_cs_client     = @@character_set_client */;
+/*!50503 SET character_set_client = utf8mb4 */;
+CREATE TABLE `broadcast_text_duration` (
+  `ID` int(10) unsigned NOT NULL DEFAULT '0',
+  `BroadcastTextID` int(11) NOT NULL DEFAULT '0',
+  `Locale` int(11) NOT NULL DEFAULT '0',
+  `Duration` int(11) NOT NULL DEFAULT '0',
+  `VerifiedBuild` int(11) NOT NULL DEFAULT '0',
+  PRIMARY KEY (`ID`,`VerifiedBuild`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
+/*!40101 SET character_set_client = @saved_cs_client */;

sql/updates/world/master/2021_10_26_00_world.sql

@@ -0,0 +1,3 @@
+-- 
+ALTER TABLE `conversation_line_template` DROP `StartTime`;
+ALTER TABLE `conversation_template` DROP `LastLineEndTime`;