Replace go-migrate with morph (#19116)

db/migrations/mysql/000004_create_command_webhooks.up.sql

@@ -0,0 +1,12 @@
+CREATE TABLE IF NOT EXISTS CommandWebhooks (
+    Id varchar(26) NOT NULL,
+    CreateAt bigint(20) DEFAULT NULL,
+    CommandId varchar(26) DEFAULT NULL,
+    UserId varchar(26) DEFAULT NULL,
+    ChannelId varchar(26) DEFAULT NULL,
+    RootId varchar(26) DEFAULT NULL,
+    ParentId varchar(26) DEFAULT NULL,
+    UseCount integer DEFAULT NULL,
+    PRIMARY KEY (Id),
+    KEY idx_command_webhook_create_at (CreateAt)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;