Backport of Handle marks on ignore_changes values into v1.0

[teamterraform]

Backport

This PR is auto-generated from #29193 to be assessed for backporting due to the inclusion of the label 1.0-backport.

WARNING automatic cherry-pick of commits failed. Commits will require human attention.

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

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Up until now marks were not considered by ignore_changes, that however
means changes to sensitivity within a configuration cannot be ignored, even
though they are planned as changes.

Rather than separating the marks and tracking their paths, we can easily
update the processIgnoreChanges routine to handle the marked values
directly. Moving the processIgnoreChanges call also cleans up some of
the variable naming, making it more consistent through the body of the
function.

Fixes #29173 in conjunction with hashicorp/hcl#478

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