Backport of Don't render a plan for module outputs into v0.14

[teamterraform]

Backport

This PR is auto-generated from #26944 to be assessed for backporting due to the inclusion of the label 0.14-backport.

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

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Module outputs should not trigger plan rendering. These are not shown in the plan output, however they were still causing Changes.Empty() to return false.

Fixes #26899

[codecov]

Codecov Report

Merging #26948 (d44c931) into v0.14 (de1574d) will increase coverage by 0.00%.
The diff coverage is 0.00%.

Impacted Files	Coverage Δ
plans/changes.go	0.80% <0.00%> (+0.80%)	⬆️
terraform/node_resource_plan.go	95.32% <0.00%> (-1.87%)	⬇️
terraform/eval_apply.go	73.45% <0.00%> (+0.58%)	⬆️
backend/local/backend_plan.go	71.08% <0.00%> (+2.40%)	⬆️

[ghost]

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