Expand test stack with service providers to allow output testing

[dpwdec]

Hello!

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Issue details

There are currently overload test functions defined that allow you to test the outputs of a mock pulumi stack during unit testing, however there is no support for this of stack output testing when using a service provider.

The TestWithServiceProviderAsync doesn't offer any overloads that expose the outputs from a stack. Link here.

But there are examples of the TestAsync function that do exactly this. Link here.

Ideally the TestWithServiceProviderAsync function would have an expanded overload to support a return type with Task<(ImmutableArray<Resource> Resources, IDictionary<string, object?> Outputs)

Affected area/feature

dotnet SDK testing

[dpwdec]

I've raised a PR #101 with the change I think needs to happen to facilitate this but I may need some review support as I don't know if this constitutes a change requiring change log updates.

[dixler]

Removed triage label as the author has opened a PR to fix this.