Suppress CS1685 warning and remove DiscUtils packages

Suppressed CS1685 warning in the test project due to a RuntimeHelpers polyfill conflict on net48. Removed DiscUtils Btrfs, HfsPlus, SquashFs, and Xfs package references from the test project -  they are already imported when needed in the main project which is then imported into the test project to test it

Author: gfs

RecursiveExtractor.Tests/RecursiveExtractor.Tests.csproj

@@ -5,13 +5,11 @@
     <IsPackable>false</IsPackable>
     <Nullable>enable</Nullable>
     <LangVersion>10.0</LangVersion>
+    <!-- CS1685: RuntimeHelpers polyfill in RecursiveExtractor (netstandard2.0) conflicts with mscorlib on net48 via InternalsVisibleTo -->
+    <NoWarn>$(NoWarn);CS1685</NoWarn>
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="LTRData.DiscUtils.Btrfs" Version="1.0.64" />
-    <PackageReference Include="LTRData.DiscUtils.HfsPlus" Version="1.0.64" />
-    <PackageReference Include="LTRData.DiscUtils.SquashFs" Version="1.0.64" />
-    <PackageReference Include="LTRData.DiscUtils.Xfs" Version="1.0.64" />
     <PackageReference Include="NLog.Extensions.Logging" Version="6.0.3" />
     <PackageReference Include="xunit" Version="2.9.3" />
     <PackageReference Include="xunit.runner.visualstudio" Version="3.0.2" />