Quarantining outstanding test failures (#18964)

* quarantining outstanding test failures

* look, what is CI even for anyway?

* shhhh

* who uses who?

src/Servers/Kestrel/test/FunctionalTests/ResponseTests.cs

@@ -640,6 +640,7 @@ namespace Microsoft.AspNetCore.Server.Kestrel.FunctionalTests
         }
 
         [Fact]
+        [Flaky("<no longer needed; tracked in Kusto>", FlakyOn.All)]
         public async Task ConnectionClosedWhenBothRequestAndResponseExperienceBackPressure()
         {
             const int bufferSize = 65536;

src/Servers/Kestrel/test/InMemory.FunctionalTests/Http2/Http2TimeoutTests.cs

@@ -316,6 +316,7 @@ namespace Microsoft.AspNetCore.Server.Kestrel.Core.Tests
         }
 
         [Fact]
+        [Flaky("<no longer needed; tracked in Kusto>", FlakyOn.All)]
         public async Task DATA_Sent_TooSlowlyDueToSocketBackPressureOnLargeWrite_AbortsConnectionAfterRateTimeout()
         {
             var mockSystemClock = _serviceContext.MockSystemClock;

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

@@ -310,6 +310,7 @@ namespace Microsoft.AspNetCore.Server.Kestrel.InMemory.FunctionalTests
         }
 
         [Theory]
+        [Flaky("<no longer needed; tracked in Kusto>", FlakyOn.All)]
         [InlineData(HttpProtocols.Http1)]
         [InlineData(HttpProtocols.Http1AndHttp2)] // Make sure Http/1.1 doesn't regress with Http/2 enabled.
         public async Task CertificatePassedToHttpContext(HttpProtocols httpProtocols)

src/Tools/dotnet-user-secrets/test/InitCommandTest.cs

@@ -4,6 +4,7 @@
 using System;
 using System.IO;
 using System.Text;
+using Microsoft.AspNetCore.Testing;
 using Microsoft.Extensions.Configuration.UserSecrets.Tests;
 using Microsoft.Extensions.SecretManager.Tools.Internal;
 using Microsoft.Extensions.Tools.Internal;
@@ -61,6 +62,7 @@ namespace Microsoft.Extensions.SecretManager.Tools.Tests
         }
 
         [Fact]
+        [Flaky("<no longer needed; tracked in Kusto>", FlakyOn.All)]
         public void AddsEscapedSpecificSecretIdToProject()
         {
             const string SecretId = @"<lots of XML invalid values>&";

src/Tools/dotnet-user-secrets/test/SecretManagerTests.cs

@@ -186,6 +186,7 @@ namespace Microsoft.Extensions.SecretManager.Tools.Tests
         }
 
         [Fact]
+        [Flaky("<no longer needed; tracked in Kusto>", FlakyOn.All)]
         public void Remove_Non_Existing_Secret()
         {
             var projectPath = _fixture.GetTempSecretProject();