oEmbed Providers: Updated the X oEmbed provider to use the x.com domain (closes #21052) (#21053)

* Updated the X oEmbed provider to use the x.com domain.

* Fixed issues raised in code review.

tests/Umbraco.Tests.Integration/Umbraco.Core/Services/OEmbedServiceTests.cs

@@ -0,0 +1,52 @@
+using NUnit.Framework;
+using Umbraco.Cms.Core.DependencyInjection;
+using Umbraco.Cms.Core.Media.EmbedProviders;
+using Umbraco.Cms.Core.Services;
+using Umbraco.Cms.Core.Services.OperationStatus;
+using Umbraco.Cms.Tests.Common.Testing;
+using Umbraco.Cms.Tests.Integration.Testing;
+
+namespace Umbraco.Cms.Tests.Integration.Umbraco.Core.Services;
+
+[TestFixture]
+[UmbracoTest(Database = UmbracoTestOptions.Database.None)]
+internal sealed class OEmbedServiceTests : UmbracoIntegrationTest
+{
+    private IOEmbedService OEmbedService => GetRequiredService<IOEmbedService>();
+
+    protected override void CustomTestSetup(IUmbracoBuilder builder)
+    {
+        base.CustomTestSetup(builder);
+
+        // Clear all providers and add only the X provider
+        builder.EmbedProviders().Clear().Append<X>();
+    }
+
+    /// <summary>
+    /// Verifies resolution to https://github.com/umbraco/Umbraco-CMS/issues/21052.
+    /// </summary>
+    /// <remarks>
+    /// Tests marked as [Explicit] as we don't want a random external service call to X to fail during regular test runs.
+    /// </remarks>
+    [Explicit]
+    [TestCase("https://x.com/THR/status/1995620384344080849?s=20")]
+    [TestCase("https://x.com/SquareEnix/status/1995780120888705216?s=20")]
+    [TestCase("https://x.com/sem_sep/status/1991750339427700739?s=20")]
+    public async Task GetMarkupAsync_WithXUrls_ReturnsSuccessAndMarkup(string url)
+    {
+        // Arrange
+        var uri = new Uri(url);
+
+        // Act
+        var result = await OEmbedService.GetMarkupAsync(uri, width: null, height: null, CancellationToken.None);
+
+        // Assert
+        Assert.Multiple(() =>
+        {
+            Assert.That(result.Success, Is.True);
+            Assert.That(result.Status, Is.EqualTo(OEmbedOperationStatus.Success));
+            Assert.That(result.Result, Is.Not.Null.And.Not.Empty);
+            Assert.That(result.Result, Does.Contain("blockquote"));
+        });
+    }
+}