[Epic] Code generation quality

[EvanBoyle]

Code generation quality spans (currently) four languages, SDK generation, and examples generation. We have substantial gaps in coverage that have led to some painful regressions in recent history. We have opportunities to make targeted testing infrastructure improvements to make it safer to make changes in this area, and to discover bugs sooner.

This becomes more important as we think about community and multi-language authors consuming this surface area, not just core pulumi team members.

While there are some advanced techniques we could use such as generative property testing, we have some low hanging fruit we should tackle first:

• Compile output from SDK generator tests #7801
• Compile output from program generator tests #7802

Adding an output compilation step in our tests will bring more confidence when making changes, and prevent future regressions. A campaign to bring more examples under the suite will simultaneously expand coverage and improve the quality of our documentation.

If we make it this far, we may want to consider closing the loop by running a preview on some of the generated programs. However, there is more complexity there (acquiring a provider binary, cloud credentials, etc) which is not well suited to the current pulumi/pulumi test infrastructure.

[iwahbe]

I'm keeping a running list of issues found from #7802:

• Python puts raise statements in lambdas.  #8062
• typescript program has invalid imports. #8063
• Go program codegen: string != pulumi.String #8064
• Go program generation includes unused import #8065
• Program codegen generates invalid TypeScript lambdas.  #8067
• TypeScript program codegen: We use the ? operator instead of the ?. operator.  #8068
• Dotnet program codegen: We use the ?[] on ImmutableArray<T>.  #8069
• Go program generation: fails to namespace some imports #8070
• Go program codegen: pulumi.AnyArray should be pulumi.Array #8072
• Go program codegen: does not correctly handle references.  #8073
• Go program codegen: Value does not implement pulumi.Input #8074
• TypeScript program codegen: Requires types that other languages don't #8075
• Go program codegen: handle providers incorrectly #8076
• Go program codegen: assumes that we can use := instead of = #8077
• C# program codegen: invalid array literal #8078
• C# references invalid string encoding.  #8079