Migrate unit and integration tests from Xunit to NUnit and update test dependencies.

Author: napoly

Monero.IntegrationTests/Monero.IntegrationTests.csproj

@@ -12,8 +12,8 @@
     <ItemGroup>
         <PackageReference Include="coverlet.collector" Version="8.0.1"/>
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.3.0"/>
-        <PackageReference Include="xunit.v3" Version="3.2.2"/>
-        <PackageReference Include="xunit.runner.visualstudio" Version="3.1.5"/>
+        <PackageReference Include="NUnit" Version="4.5.1" />
+        <PackageReference Include="NUnit3TestAdapter" Version="6.2.0" />
     </ItemGroup>
 
     <ItemGroup>