dedupeTypes not run from Pulumi CLI generation

[danielrbradley]

When running Java code generation via pulumi package gen-sdk, it doesn't run the dedupeTypes method which fixes certain aspects of the schema around duplicates and casing.

Similar to #1500, this method needs to be on the code path for both the standalone binary but also the GeneratePackage entry point for the Pulumi CLI.

Referece:

pulumi-java/pkg/cmd/pulumi-java-gen/generate.go

Line 56 in 6c1c330

pkgSpec, err := dedupTypes(rawPkgSpec)

[danielrbradley]

An initially spike of this show it's not entirely trivial because the deDup method requires a PackageSpec rather than a Package, so will need to be reworked.

Spike: https://github.com/pulumi/pulumi-java/compare/1508-move-dedup