chore: Add System.IO.Abstractions.Extensions to all tests

src/Directory.Build.props

@@ -57,6 +57,7 @@
     <PackageReference Include="Serilog.Sinks.NUnit" PrivateAssets="All" />
     <PackageReference Include="Serilog.Sinks.TestCorrelator" PrivateAssets="All" />
     <PackageReference Include="System.IO.Abstractions.TestingHelpers" PrivateAssets="All" />
+    <PackageReference Include="TestableIO.System.IO.Abstractions.Extensions" PrivateAssets="All" />
   </ItemGroup>
 
   <ItemGroup Condition="$(ProjectName.EndsWith('.Tests'))">

src/Directory.Build.targets

@@ -37,6 +37,7 @@
     <PackageReference Update="Serilog.Sinks.TestCorrelator" Version="3.*" />
     <PackageReference Update="System.Data.HashFunction.FNV" Version="2.*" />
     <PackageReference Update="System.IO.Abstractions" Version="16.*" />
+    <PackageReference Update="TestableIO.System.IO.Abstractions.Extensions" Version="1.*" />
     <PackageReference Update="System.IO.Abstractions.TestingHelpers" Version="16.*" />
     <PackageReference Update="System.Reactive" Version="5.*" />
     <PackageReference Update="YamlDotNet" Version="11.*" />