Add support for easier CentralPackageManagement options

Is your feature request related to a problem? Please describe.

As CentralPacakgeManagement becomes more mainstream it is something we would like to offer as an option in our templates like:

dotnet new mytemplate -cpm

Currently we would need to have dependencies in our template like:

<ItemGroup>
  <!--#if (useCentralPackageManagement)-->
  <PackageReference Include="PackageA" />
  <PackageReference Include="PackageB" />
  <!--#else-->
  <PackageReference Include="PackageA" Version="8.0.0" />
  <PackageReference Include="PackageB" Version="8.0.0" />
  <!--#endif-->
</ItemGroup>

Describe the solution you’d like.

Add a post action that can work from any host (VS/CLI/etc) which can remove versions on PackageReferences. This could be purpose build to strip out any PackageReference Version. Or to make this the most useful for a variety of situations perhaps a Regex Replace Post Action could be more useful.

"postActions": [{
  "condition": "(useCentralPackageManagement)",
  "description": "Removes the PackageReference Versions in the generated csproj.",
  "args": {
    "files": "**\\*.csproj",
    "pattern": "(\\s?Version=\\\"\\d+\\.\\d+(.\\d+)?(.\\d+)?(-[A-Za-z\\.0-9]+)?\\\")",
    "replace": ""
  },
  "manualInstructions": [{
    "text": "Remove the PackageReference Versions'"
  }],
  "actionId": "Some Id",
  "continueOnError": false
}]

Additional context

No response

[YuliiaKovalova]

@Evangelink , we are investigating the possibility of PostAction usage for resolving this issue. I will let you know once we know more.

[YuliiaKovalova]

Close due to the existing workaround described in https://github.com/dotnet/templating/issues/6187#issuecomment-1572223281.