[EC-756] Add missing EF scripts to add new 'Events' table 'SystemUser' column (#2414)

* [EC-756] Add missing Postgres migration script

* [EC-756] Add missing MySQL migration script

util/MySqlMigrations/Scripts/2022-09-27_00_EventsSystemUser.sql

@@ -0,0 +1,8 @@
+START TRANSACTION;
+
+ALTER TABLE `Event` ADD `SystemUser` tinyint unsigned NULL;
+
+INSERT INTO `__EFMigrationsHistory` (`MigrationId`, `ProductVersion`)
+VALUES ('20220927142038_EventsSystemUser', '6.0.4');
+
+COMMIT;

util/PostgresMigrations/Scripts/2022-09-27_00_EventsSystemUser.psql

@@ -0,0 +1,8 @@
+START TRANSACTION;
+
+ALTER TABLE "Event" ADD "SystemUser" smallint NULL;
+
+INSERT INTO "__EFMigrationsHistory" ("MigrationId", "ProductVersion")
+VALUES ('20220927142152_EventsSystemUser', '6.0.4');
+
+COMMIT;