Backport of Add documentation to refactor Terraform state into v1.7

[github-actions]

Backport

This PR is auto-generated from #36962 to be assessed for backporting due to the inclusion of the label 1.7-backport.

🚨

Warning automatic cherry-pick of commits failed. If the first commit failed,
you will see a blank no-op commit below. If at least one commit succeeded, you
will see the cherry-picked commits up to, not including, the commit where
the merge conflict occurred.

The person who merged in the original PR is:
@BrianMMcClain
This person should manually cherry-pick the original PR into a new backport PR,
and close this one when the manual backport PR is merged in.

merge conflict error: unable to process merge commit: "7604605aca91ce26b8f268b037e48282c39a08ad", automatic backport requires rebase workflow

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

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Adds documentation discussing the concepts and approaches behind refactoring Terraform state and config

• This change is user-facing and I added a changelog entry.
• This change is not user-facing.

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Overview of commits

• 370bd59

• 7604605

• aae573a

• ac8936a

• e93a179

• 9e56236