Exclude css isolation assets from `dotnet publish`

Originally posted at [StackOverflow](https://stackoverflow.com/q/72448577/9971404), but there seems no way to control this. So I'm adding as a feature request. Thank you.

### Is there an existing issue for this?

- [X] I have searched the existing issues

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

I'm using RazorPages (on ASP.NET Core 6) and "css isolation". The css files are generated at `obj/{Debug,Release}/net6.0/scopedcss/Pages/`, and are included when performing a `dotnet publish`.

I also use Webpack, so I don't need to publish those css files (they are already bundled by Webpack).

I added variations of all of these to my `Project.csproj` without success:
````xml

````

````xml

````

````xml

````

````xml

````

````xml

````

````xml

$(DefaultItemExcludes);obj/*/*/scopedcss/**/*

````

These (and variations of them in every combination) did not work.

### Describe the solution you'd like

Please provide a way to exclude css isolation assets from `dotnet publish`.

### Additional context

My non-ideal workaround is to delete the files after publish:
````xml

````