Upgrade tfgen to generate FunctionSpec.Outputs instead of FunctionSpec.ReturnType

[t0yv0]

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Issue details

FunctionSpec.Outputs is deprecated in favor of FunctionSpec.ReturnType. Please upgrade tfgen/tfbridge to generate schemas accordingly.

Ref: pulumi/pulumi#11753

Fully implementing this will also require runtime support from both pre-PluginFramework tfbridge and the PluginFramework bridge. When converting function result types at runtime, if schema generator opts to emit a non-object-types (flattened) return type for an invoke, the runtime converters have to translate between Terraform and Pulumi representation in that case.

Affected area/feature