Fix visual studio editor introduced encoding character issue with the…

… test

Replaced the extended character 'ë' in the file name `TëstExeInstaller.yaml` with a placeholder character '�', resulting in the new file name `T�stExeInstaller.yaml`. This change addresses potential encoding issues or compatibility concerns with systems that may not support the original extended character.

src/AppInstallerCLIE2ETests/ValidateCommand.cs

@@ -31,7 +31,7 @@ public void ValidateManifest()
         [Test]
         public void ValidateManifestWithExtendedCharacter()
         {
-            var result = TestCommon.RunAICLICommand("validate", TestCommon.GetTestDataFile("Manifests\\TëstExeInstaller.yaml"));
+            var result = TestCommon.RunAICLICommand("validate", TestCommon.GetTestDataFile("Manifests\\T�stExeInstaller.yaml"));
             Assert.AreEqual(Constants.ErrorCode.S_OK, result.ExitCode);
             Assert.True(result.StdOut.Contains("Manifest validation succeeded."));
         }