We model providers as resources in our state file, but we were
neglecting to set Outputs for these resources. This was problematic
when we started to try to run DiffConfig, because when diffing a
resource we compare thed new inputs and the old outputs, but the
resource never had any old outputs, so it was impossible for the
provider to see what the old state of the resource was.
To fix this, we now reflect the inputs we use the create the provider
reference as outputs on the resource.
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