Unify remaining DB model classes between SQLite and Postgres.

As part of this, the ban and unban table were renamed to server_* on SQLite to move them in line with Postgres. Data is preserved.

Content.Server.Database/Migrations/Postgres/20220127170845_UnifyMore.cs

@@ -0,0 +1,19 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace Content.Server.Database.Migrations.Postgres
+{
+    public partial class UnifyMore : Migration
+    {
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+
+        }
+
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+
+        }
+    }
+}