We currently include `version.txt` in the package via `<Content Include="version.txt">`. This places the file in the NuGet package in two locations: the `content` directory and `contentFiles`.
We want the file to be in `content` because this is where the Pulumi .NET Language host looks for the file when determining a program's required plugins.
However, having the file in `contentFiles` is problematic. For packages that reference other Pulumi resource packages (e.g. for multi-lang components), referenced `contentFiles` are included in the package by default. This means another package's `version.txt` will be included and used over the current project's `version.txt`. For example, if a multi-lang component package `Pulumi.Xyz` references `Pulumi.Aws`, the `version.txt` from `Pulumi.Aws` will be used in `Pulumi.Xyz` package rather than the intended `version.txt` for `Pulumi.Xyz`.
To address this, stop including `version.txt` in `contentFiles`. We do this by changing the `<Content Include="version.txt" />` to `<None Include="version.txt" Pack="True" PackagePath="content" />` in the project file. This ensures the file will still be included in the package in the `content` dir (where the Pulumi .NET language host expects to find it), but doesn't include the file in `contentFiles` which would cause it to be used in other packages that reference the package.
Further, when generating `<PackageReference>`s for packages that start with "Pulumi.", include an additional `ExcludeAssets="contentFiles"` attribute to prevent the package's `contentFiles` from being included.
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