Fix Build for Tests and Update Image Version

[KyleMcMaster]

This pull request fixes a build issue by updating the TestContainer builder to pass the image argument into the constructor rather than the WithImage method. It also updates the SQL Server Docker image used for integration testing to a newer version 2025.

Dependency update for test environment:

• Updated the SQL Server Docker image in the MsSqlBuilder constructor from mcr.microsoft.com/mssql/server:2022-latest to mcr.microsoft.com/mssql/server:2025-latest in CustomWebApplicationFactory.cs, ensuring tests run against the latest SQL Server version.

[MartinHock]

I would sugggest a slighly different version of create host.
protected override IHost CreateHost(IHostBuilder builder)
{
builder.UseEnvironment("Testing");

var host = builder.Build();
host.Start();

using var scope = host.Services.CreateScope();
var services = scope.ServiceProvider;

var db = services.GetRequiredService();
var logger = services.GetRequiredService<ILogger<CustomWebApplicationFactory>>();

try
{
if (_dbContainer != null)
{
// SQL Server → run migrations
db.Database.Migrate();
}
else
{
// SQLite fallback
db.Database.EnsureCreated();
}

// 🔥 CRITICAL: run seeding and FAIL HARD if it breaks
SeedData.InitializeAsync(db)
  .GetAwaiter()
  .GetResult();

// 🔍 Verify seeding worked
var contributorCount = db.Contributors.Count();

logger.LogInformation("Seeded {Count} contributors.", contributorCount);

if (contributorCount == 0)
{
  throw new InvalidOperationException(
    "Database seeding completed, but no contributors were created.");
}

}
catch (Exception ex)
{
logger.LogError(ex,
"An error occurred seeding the database. Error: {Message}",
ex.Message);

throw; // 🔥 DO NOT SWALLOW — fail tests immediately

}

return host;
}