Social distancing for tests that are symptomatic

These tests failed in official builds last night.

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

@@ -72,6 +72,7 @@ namespace Microsoft.Extensions.SecretManager.Tools.Tests
         }
 
         [Fact]
+        [QuarantinedTest]
         public void DoesNotGenerateIdForProjectWithSecretId()
         {
             const string SecretId = "AlreadyExists";

src/Tools/dotnet-watch/test/ProgramTests.cs

@@ -24,6 +24,7 @@ namespace Microsoft.DotNet.Watcher.Tools.Tests
         }
 
         [Fact]
+        [QuarantinedTest]
         public async Task ConsoleCancelKey()
         {
             _tempDir