Update and rename fakecsproj.txt to fakecsproj.csproj

Author: nicolas63

generators/dotnetcore/templates/dotnetcore/src/fakecsproj.txt renamed to generators/dotnetcore/templates/dotnetcore/src/fakecsproj.csproj

@@ -5,7 +5,6 @@
   <!-- https://github.com/dependabot/dependabot-core/issues/8590 -->
   <PropertyGroup>
     <TargetFramework>net9.0</TargetFramework>
-    <ManagePackageVersionsCentrally>true</ManagePackageVersionsCentrally>
   </PropertyGroup>
 
   <ItemGroup>