Test: refreshing programs with custom providers

[t0yv0]

#164 started on the path of of enabling configuring OpenTOFU providers powering a module instance.

We need to add test making sure refreshing such programs does work:

const provider = new bucket.Provider("test-provider", {
    aws: {
        "region": "us-west-2" // opentofu provider configuration
    }
})

const m = new bucket.Module("mymod", {}, {provider: provider});