Backport of generate precise resource types during validate into v1.1

[teamterraform]

Backport

This PR is auto-generated from #29862 to be assessed for backporting due to the inclusion of the label 1.1-backport.

The below text is copied from the body of the original PR.

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Allow GetResource to return correctly typed values during validation, rather than relying on cty.DynamicVal as a placeholder. This allows other dependent expressions to be more correctly evaluated.

There is no reason we must use the stored state to find the provider address for evaluation. We don't need the exact provider instance here, since we are only looking for the schema and the schema lookup is done with a simple provider type.

Once we have the resource type, we can return correctly shaped unknown values for validation based on the expansion mode of the resource configuration.

Fixes the specific case shown in #29809

[github-actions]

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