Fix broken acceptance tests on pipeline (#4080)

test/IntegrationTests/MSTest.Acceptance.IntegrationTests/SdkTests.cs

@@ -311,7 +311,9 @@ namespace MSTestSdkTest
                     AssetName,
                     SingleTestSourceCode
                     .PatchCodeWithReplace("$MSTestVersion$", MSTestVersion)
-                    .PatchCodeWithReplace("$TargetFramework$", TargetFrameworks.NetCurrent.Arguments)
+                    // temporarily set test to be on net9.0 as it's fixing one error that started to happen:  error IL3000: System.Net.Quic.MsQuicApi..cctor
+                    // see https://github.com/dotnet/sdk/issues/44880.
+                    .PatchCodeWithReplace("$TargetFramework$", "net9.0")
                     .PatchCodeWithReplace("$ExtraProperties$", $"""
                 <PublishAot>true</PublishAot>
                 <EnableMicrosoftTestingExtensionsCodeCoverage>false</EnableMicrosoftTestingExtensionsCodeCoverage>
@@ -319,14 +321,14 @@ namespace MSTestSdkTest
                     addPublicFeeds: true);
 
                 DotnetMuxerResult compilationResult = await DotnetCli.RunAsync(
-                    $"publish -r {RID} -f {TargetFrameworks.NetCurrent.Arguments} {testAsset.TargetAssetPath}",
+                    $"publish -r {RID} -f net9.0 {testAsset.TargetAssetPath}",
                     _acceptanceFixture.NuGetGlobalPackagesFolder.Path,
                     // We prefer to use the outer retry mechanism as we need some extra checks
                     retryCount: 0);
                 compilationResult.AssertOutputContains("Generating native code");
                 compilationResult.AssertOutputNotContains("warning");
 
-                var testHost = TestHost.LocateFrom(testAsset.TargetAssetPath, AssetName, TargetFrameworks.NetCurrent.Arguments, verb: Verb.publish);
+                var testHost = TestHost.LocateFrom(testAsset.TargetAssetPath, AssetName, "net9.0", verb: Verb.publish);
                 TestHostResult testHostResult = await testHost.ExecuteAsync();
 
                 testHostResult.AssertExitCodeIs(ExitCodes.Success);

test/Utilities/Microsoft.Testing.TestInfrastructure/TempDirectory.cs

@@ -171,6 +171,8 @@ public class TempDirectory : IDisposable
       <!-- Do not warn about package downgrade. NuGet uses alphabetical sort as ordering so -dev or -ci are considered downgrades of -preview. -->
       <NoWarn>NU1605</NoWarn>
       <RunAnalyzers>false</RunAnalyzers>
+      <!-- Prevent build warnings/errors on unsupported TFMs -->
+      <CheckEolTargetFramework>false</CheckEolTargetFramework>
     </PropertyGroup>
 </Project>
 """);