Unify the nullable reference type approaches (#48776)

Author: jaredpar

Directory.Build.targets

@@ -9,7 +9,7 @@
       We still check $(TargetFrameworks) for empty though, because for single-targeted builds we want to
       allow nullable warnings regardless of target framework.
     -->
-    <NoWarn Condition="'$(DisableNullableWarnings)' == '' AND  '$(TargetFrameworks)' != '' AND '$(TargetFramework)' != '' AND '$(TargetFrameworkIdentifier)' != '.NETCoreApp'">$(NoWarn);Nullable</NoWarn>
+    <NoWarn Condition="'$(TargetFrameworks)' != '' AND '$(TargetFramework)' != '' AND '$(TargetFrameworkIdentifier)' != '.NETCoreApp'">$(NoWarn);Nullable</NoWarn>
   </PropertyGroup>
 
   <ItemGroup>

src/BuiltInTools/HotReloadAgent.Data/Microsoft.DotNet.HotReload.Agent.Data.Package.csproj

@@ -7,7 +7,6 @@
     <GenerateDocumentationFile>false</GenerateDocumentationFile>
     <DebugType>none</DebugType>
     <GenerateDependencyFile>false</GenerateDependencyFile>
-    <Nullable>enable</Nullable>
     <LangVersion>preview</LangVersion>
 
     <!-- NuGet -->

src/BuiltInTools/HotReloadAgent.PipeRpc/Microsoft.DotNet.HotReload.Agent.PipeRpc.Package.csproj

@@ -7,7 +7,6 @@
     <GenerateDocumentationFile>false</GenerateDocumentationFile>
     <DebugType>none</DebugType>
     <GenerateDependencyFile>false</GenerateDependencyFile>
-    <Nullable>enable</Nullable>
     <LangVersion>preview</LangVersion>
 
     <!-- NuGet -->

src/BuiltInTools/HotReloadAgent/Microsoft.DotNet.HotReload.Agent.Package.csproj

@@ -8,7 +8,6 @@
     <GenerateDocumentationFile>false</GenerateDocumentationFile>
     <DebugType>none</DebugType>
     <GenerateDependencyFile>false</GenerateDependencyFile>
-    <Nullable>enable</Nullable>
     <LangVersion>preview</LangVersion>
 
     <!-- NuGet -->

src/Cli/dotnet/AspNetCoreCertificateGenerator.cs

@@ -1,6 +1,8 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
+#nullable disable
+
 using Microsoft.DotNet.Configurer;
 
 namespace Microsoft.DotNet.Cli;

src/Cli/dotnet/AutomaticEncodingRestorer.cs

@@ -1,6 +1,8 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
+#nullable disable
+
 using System.Security;
 
 namespace Microsoft.DotNet.Cli;

src/Cli/dotnet/BuildServer/BuildServerException.cs

@@ -1,6 +1,8 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
+#nullable disable
+
 namespace Microsoft.DotNet.Cli.BuildServer;
 
 internal class BuildServerException : Exception

src/Cli/dotnet/BuildServer/BuildServerProvider.cs

@@ -1,6 +1,8 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
+#nullable disable
+
 using Microsoft.DotNet.Cli.Utils;
 using Microsoft.DotNet.Cli.Utils.Extensions;
 using Microsoft.DotNet.Configurer;

src/Cli/dotnet/BuildServer/IBuildServer.cs

@@ -1,6 +1,8 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
+#nullable disable
+
 namespace Microsoft.DotNet.Cli.BuildServer;
 
 internal interface IBuildServer

src/Cli/dotnet/BuildServer/IBuildServerProvider.cs

@@ -1,6 +1,8 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
+#nullable disable
+
 namespace Microsoft.DotNet.Cli.BuildServer;
 
 [Flags]