save read data in the refresh state during plan

[jbardin]

This only changes the refreshed state stored in the plan file. Since the
change is stored in the plan, the applied result would be the same, but
we should still store the refreshed data in the plan file for tools that
consume the plan file.

This will also be needed in order to implement a new refresh command
based on the plan itself.

[codecov]

Codecov Report

Merging #26285 into master will decrease coverage by 1.12%.
The diff coverage is 89.47%.

Impacted Files	Coverage Δ
backend/local/backend_apply.go	41.09% <ø> (+1.74%)	⬆️
helper/resource/testing_config.go	0.00% <0.00%> (ø)
plans/plan.go	40.00% <ø> (-8.00%)	⬇️
terraform/evaluate.go	50.56% <ø> (-2.18%)	⬇️
backend/local/backend_plan.go	71.81% <100.00%> (-1.76%)	⬇️
configs/module_call.go	69.33% <100.00%> (+1.76%)	⬆️
configs/named_values.go	67.75% <100.00%> (+0.16%)	⬆️
configs/resource.go	81.64% <100.00%> (-0.18%)	⬇️
terraform/context.go	87.87% <100.00%> (+1.41%)	⬆️
terraform/eval_context_builtin.go	74.62% <100.00%> (-2.74%)	⬇️
... and 645 more

[ghost]

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