Add some integration tests for the Server project (#6839)

* Add some integration tests for the Server project

* Not sure why this project got removed?

* Format

* capture debug output

* Update tests to work with the now legacy WebHostBuilder

- I accidentally had the updated Program locally and that was why tests were working for me locally

* Formatting...again

test/Server.IntegrationTest/Server.cs

@@ -0,0 +1,45 @@
+using Microsoft.AspNetCore.Hosting;
+using Microsoft.AspNetCore.Mvc.Testing;
+using Microsoft.AspNetCore.TestHost;
+
+namespace Bit.Server.IntegrationTest;
+
+public class Server : WebApplicationFactory<Program>
+{
+    public string? ContentRoot { get; set; }
+    public string? WebRoot { get; set; }
+    public bool ServeUnknown { get; set; }
+    public bool? WebVault { get; set; }
+    public string? AppIdLocation { get; set; }
+
+    protected override IWebHostBuilder? CreateWebHostBuilder()
+    {
+        var args = new List<string>
+        {
+            "/contentRoot",
+            ContentRoot ?? "",
+            "/webRoot",
+            WebRoot ?? "",
+            "/serveUnknown",
+            ServeUnknown.ToString().ToLowerInvariant(),
+        };
+
+        if (WebVault.HasValue)
+        {
+            args.Add("/webVault");
+            args.Add(WebVault.Value.ToString().ToLowerInvariant());
+        }
+
+        if (!string.IsNullOrEmpty(AppIdLocation))
+        {
+            args.Add("/appIdLocation");
+            args.Add(AppIdLocation);
+        }
+
+        var builder = WebHostBuilderFactory.CreateFromTypesAssemblyEntryPoint<Program>([.. args])
+            ?? throw new InvalidProgramException("Could not create builder from assembly.");
+
+        builder.UseSetting("TEST_CONTENTROOT_SERVER", ContentRoot);
+        return builder;
+    }
+}