Fix build failure occurring in Azure Pipelines

The build error was caused by project dependencies defined in the solution file.
Dependencies were configured at the solution level, Azure Pipelines failed to build the affected project.

Author: gekka

NuGet.sln

@@ -161,9 +161,6 @@ EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "NuGet.XPlat.FuncTest", "test\NuGet.Core.FuncTests\NuGet.XPlat.FuncTest\NuGet.XPlat.FuncTest.csproj", "{2034C981-C938-4F0F-8F3B-528B83CB8F7D}"
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "NuGet.Build.Tasks.Pack.Test", "test\NuGet.Core.Tests\NuGet.Build.Tasks.Pack.Test\NuGet.Build.Tasks.Pack.Test.csproj", "{8BF8279D-196F-481A-9659-488864D93D2D}"
-	ProjectSection(ProjectDependencies) = postProject
-		{3B96F91B-3B58-40ED-B06E-5CD133A79A63} = {3B96F91B-3B58-40ED-B06E-5CD133A79A63}
-	EndProjectSection
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "NuGet.Build.Tasks.Pack", "src\NuGet.Core\NuGet.Build.Tasks.Pack\NuGet.Build.Tasks.Pack.csproj", "{16863138-7C0E-49ED-A1C8-B9165FED9920}"
 EndProject

test/NuGet.Core.Tests/NuGet.Build.Tasks.Pack.Test/NuGet.Build.Tasks.Pack.Test.csproj

@@ -10,6 +10,7 @@
   </ItemGroup>
 
   <ItemGroup>
+    <ProjectReference Include="..\..\..\src\NuGet.Core\NuGet.Build.Tasks\NuGet.Build.Tasks.csproj" />
     <ProjectReference Include="..\..\TestUtilities\Test.Utility\Test.Utility.csproj" />
     <ProjectReference Include="..\..\..\src\NuGet.Core\NuGet.Build.Tasks.Pack\NuGet.Build.Tasks.Pack.csproj" />
   </ItemGroup>