Remove all EF migrations

osu.Game/Migrations/20210412045700_RefreshVolumeBindingsAgain.cs

@@ -1,16 +0,0 @@
-using Microsoft.EntityFrameworkCore.Migrations;
-
-namespace osu.Game.Migrations
-{
-    public partial class RefreshVolumeBindingsAgain : Migration
-    {
-        protected override void Up(MigrationBuilder migrationBuilder)
-        {
-            migrationBuilder.Sql("DELETE FROM KeyBinding WHERE action in (6,7)");
-        }
-
-        protected override void Down(MigrationBuilder migrationBuilder)
-        {
-        }
-    }
-}