Apply xunit configuration to all tests for better test failure diagnostics

Author: tmat

test/Directory.Build.props

@@ -38,4 +38,7 @@
     <Using Include="Xunit.Abstractions" />
   </ItemGroup>
 
+  <ItemGroup>
+    <Content Include="xunit.runner.json" CopyToOutputDirectory="PreserveNewest" />
+  </ItemGroup>
 </Project>

test/dotnet-new.Tests/dotnet-new.IntegrationTests.csproj

@@ -76,7 +76,6 @@ namespace Microsoft.DotNet.Cli.New.IntegrationTests
 
   <ItemGroup>
     <Content Include="TestTemplates\**\*" Exclude="TestTemplates\**\bin\**;TestTemplates\**\obj\**" CopyToOutputDirectory="PreserveNewest" />
-    <Content Include="xunit.runner.json" CopyToOutputDirectory="PreserveNewest" />
   </ItemGroup>
 
   <ItemGroup>

test/dotnet-new.Tests/xunit.runner.json

@@ -9,9 +9,6 @@
     <Compile Include="..\..\src\Tasks\Microsoft.NET.Build.Tasks.UnitTests\Mocks\MockBuildEngine.cs" Link="Utilities\MockBuildEngine.cs" />
     <Compile Include="..\..\src\Tasks\Microsoft.NET.Build.Tasks.UnitTests\Mocks\MockTaskItem.cs" Link="Utilities\MockTaskItem.cs" />
   </ItemGroup>
-  <ItemGroup>
-    <Content Include="xunit.runner.json" CopyToOutputDirectory="PreserveNewest" />
-  </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="$(RepoRoot)\src\BuiltInTools\dotnet-watch\dotnet-watch.csproj" />
     <ProjectReference Include="$(RepoRoot)\src\BuiltInTools\DotNetWatchTasks\DotNetWatchTasks.csproj" />

test/dotnet-watch.Tests/dotnet-watch.Tests.csproj

@@ -125,10 +125,6 @@
     <PackageReference Include="Microsoft.DotNet.Installer.Windows.Security.TestData" GeneratePathProperty="true" />
   </ItemGroup>
 
-  <ItemGroup>
-    <Content Include="xunit.runner.json" CopyToOutputDirectory="PreserveNewest" />
-  </ItemGroup>
-
   <!-- Global usings -->
   <!-- See: https://learn.microsoft.com/dotnet/core/project-sdk/msbuild-props#using -->
   <ItemGroup>