Backport of Decode change values with marks into v0.15

[teamterraform]

Backport

This PR is auto-generated from #28687 to be assessed for backporting due to the inclusion of the label 0.15-backport.

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

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When decoding change values, the stored marks should be applied to the decoded value, as this is the direct inverse of the Encode operation. The missing marks were not noticed in most cases because they would be correctly re-evaluated on demand, however some cases like module output values can rely on the change source alone, resulting in the marks being lost during apply.

Many call sites which were aware that the marks were missing would manually apply the marks after decoding. After removing the duplicate marking and verifying tests, Decode call sites were again statically located and checked for mark handling. Any locations found that were relying on the absence of marks now must manually strip the marks before processing the values.

Fixes #28671

[github-actions]

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