Up until now marks were not considered by `ignore_changes`, that however
means changes to sensitivity within a configuration cannot 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.
This is part of a general effort to move all of Terraform's non-library
package surface under internal in order to reinforce that these are for
internal use within Terraform only.
If you were previously importing packages under this prefix into an
external codebase, you could pin to an earlier release tag as an interim
solution until you've make a plan to achieve the same functionality some
other way.
