Fix IDE0055 formatting errors in Fitnet migration files

Add missing blank lines between namespace declarations and using statements, and add missing using System.Diagnostics.CodeAnalysis for ExcludeFromCodeCoverage attribute in three migration files.

Co-authored-by: kamilbaczek <74410956+kamilbaczek@users.noreply.github.com>

Author: Copilot

Chapter-3-microservice-extraction/Fitnet/Src/Offers/Fitnet.Offers.DataAccess/Database/Migrations/20230503180337_CreateOffersTable.cs

@@ -1,6 +1,7 @@
 #nullable disable
 
 namespace SuperSimpleArchitecture.Fitnet.Migrations.OffersPersistenceMigrations;
+
 using System;
 using System.Diagnostics.CodeAnalysis;
 using Microsoft.EntityFrameworkCore.Migrations;

Chapter-3-microservice-extraction/Fitnet/Src/Passes/Fitnet.Passes.DataAccess/Database/Migrations/20230503180338_CreatePassesTable.cs

@@ -1,7 +1,9 @@
 #nullable disable
 
 namespace EvolutionaryArchitecture.Fitnet.Passes.DataAccess.Database;
+
 using System;
+using System.Diagnostics.CodeAnalysis;
 using Microsoft.EntityFrameworkCore.Migrations;
 
 [ExcludeFromCodeCoverage]

Chapter-3-microservice-extraction/Fitnet/Src/Passes/Fitnet.Passes.DataAccess/Database/Migrations/20250927073029_AddMissingForeignKeys.cs

@@ -1,8 +1,11 @@
 #nullable disable
 
 namespace EvolutionaryArchitecture.Fitnet.Passes.DataAccess.Database.Migrations;
+
+using System.Diagnostics.CodeAnalysis;
 using Microsoft.EntityFrameworkCore.Migrations;
 
+[ExcludeFromCodeCoverage]
 /// <inheritdoc />
 public partial class AddMissingForeignKeys : Migration
 {