Quarantine 2 flaky tests (#20032)

src/Servers/Kestrel/test/InMemory.FunctionalTests/HttpsTests.cs

@@ -219,6 +219,7 @@ namespace Microsoft.AspNetCore.Server.Kestrel.InMemory.FunctionalTests
 
         [Fact]
         [Repeat(20)]
+        [QuarantinedTest]
         public async Task DoesNotThrowObjectDisposedExceptionFromWriteAsyncAfterConnectionIsAborted()
         {
             var tcs = new TaskCompletionSource<object>(TaskCreationOptions.RunContinuationsAsynchronously);

src/Servers/Kestrel/test/Interop.FunctionalTests/HttpClientHttp2InteropTests.cs

@@ -1251,6 +1251,7 @@ namespace Interop.FunctionalTests
         }
 
         [Theory]
+        [QuarantinedTest]
         [MemberData(nameof(SupportedSchemes))]
         public async Task Settings_MaxConcurrentStreamsPost_Server(string scheme)
         {