COH-30809 Resolve SSL issues in .NET client tests - switch back to NUnit tests

[git-p4: depot-paths = "//dev/main.net/": change = 111288]

Author: vasac

tests/Coherence.Pof.Tests/Coherence.Pof.Tests.csproj

@@ -16,7 +16,6 @@
     <PackageReference Include="NUnit3TestAdapter" Version="3.17.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.9.4" />
     <PackageReference Include="TestCentric.Metadata" Version="2.0.0" />
-    <PackageReference Include="XunitXml.TestLogger" Version="4.0.254" />
   </ItemGroup>
 
   <ItemGroup>

tests/Coherence.Tests/Coherence.Tests.csproj

@@ -20,7 +20,6 @@
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.9.4" />
     <PackageReference Include="System.Text.Json" Version="6.0.9" />
     <PackageReference Include="TestCentric.Metadata" Version="2.0.0" />
-    <PackageReference Include="XunitXml.TestLogger" Version="4.0.254" />
   </ItemGroup>
 
   <ItemGroup>