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.
* Make `async:true` the default for `invoke` calls (#3750)
* Switch away from native grpc impl. (#3728)
* Remove usage of the 'deasync' library from @pulumi/pulumi. (#3752)
* Only retry as long as we get unavailable back. Anything else continues. (#3769)
* Handle all errors for now. (#3781)
* Do not assume --yes was present when using pulumi in non-interactive mode (#3793)
* Upgrade all paths for sdk and pkg to v2
* Backport C# invoke classes and other recent gen changes (#4288)
Adjust C# generation
* Replace IDeployment with a sealed class (#4318)
Replace IDeployment with a sealed class
* .NET: default to args subtype rather than Args.Empty (#4320)
* Adding system namespace for Dotnet code gen
This is required for using Obsolute attributes for deprecations
```
Iam/InstanceProfile.cs(142,10): error CS0246: The type or namespace name 'ObsoleteAttribute' could not be found (are you missing a using directive or an assembly reference?) [/Users/stack72/code/go/src/github.com/pulumi/pulumi-aws/sdk/dotnet/Pulumi.Aws.csproj]
Iam/InstanceProfile.cs(142,10): error CS0246: The type or namespace name 'Obsolete' could not be found (are you missing a using directive or an assembly reference?) [/Users/stack72/code/go/src/github.com/pulumi/pulumi-aws/sdk/dotnet/Pulumi.Aws.csproj]
```
* Fix the nullability of config type properties in C# codegen (#4379)
The schema format is described in pkg/codegen/schema/schema.go. The code
generators are derived from the code generators contained in
https://github.com/pulumi/pulumi-terraform-bridge/pkg/tfgen, with the
exception of the Go code generator, which is net new.
