test(e2e): handle experimental runtime package name in PackageShouldIncludeRuntimeDependency

The expected Microsoft.WindowsAppRuntime package name was derived as
'.{major}.{minor}', which only matches stable (1.x) packaging. Experimental
2.x ships as 'Microsoft.WindowsAppRuntime.{major}-experimental{N}' (no minor,
with the suffix). When the experimental feed bumped to -experimental7 the
test started asserting an outdated stable-style name against the actual
experimental dependency in the MSIX.

Detect the -experimental suffix in the SDK version and build the expected
runtime name accordingly. Test-only change.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: nmetulev

src/winapp-CLI/WinApp.Cli.Tests/EndToEndTests.cs

@@ -249,7 +249,23 @@ public async Task E2E_DotNetApp_PackageShouldIncludeRuntimeDependency(string sdk
             Path.Combine(extractDir, "AppxManifest.xml"), TestContext.CancellationToken);
 
         var versionParts = winAppSdkVersion.Split('.');
-        var expectedRuntimeName = $"Microsoft.WindowsAppRuntime.{versionParts[0]}.{versionParts[1]}";
+
+        // Compute expected WindowsAppRuntime package name. Naming convention differs:
+        //   Stable      (e.g. 1.8.x)            -> Microsoft.WindowsAppRuntime.{major}.{minor}
+        //   Experimental 2.x (e.g. 2.0.0-experimental7) -> Microsoft.WindowsAppRuntime.{major}-experimental{N}
+        // The experimental suffix lives on the last dotted segment as "...-experimentalN",
+        // and ships in the runtime name without the minor component.
+        string expectedRuntimeName;
+        var experimentalIdx = winAppSdkVersion.IndexOf("-experimental", StringComparison.OrdinalIgnoreCase);
+        if (experimentalIdx >= 0)
+        {
+            var experimentalSuffix = winAppSdkVersion.Substring(experimentalIdx);
+            expectedRuntimeName = $"Microsoft.WindowsAppRuntime.{versionParts[0]}{experimentalSuffix}";
+        }
+        else
+        {
+            expectedRuntimeName = $"Microsoft.WindowsAppRuntime.{versionParts[0]}.{versionParts[1]}";
+        }
 
         Assert.Contains("<PackageDependency", finalManifest,
             "Manifest should contain a PackageDependency element");