Skip writing variable validations into the state file

[liamcervante]

This PR skips variable validations when it comes time to write variables into the state file for the v1.6 series. This ensures that we won't see errors when earlier series try to read remote state from the v1.6 releases, and users can switch between Terraform versions.

This is intended to be a temporary workaround only, when v1.7 releases we will see the same errors again but we will have given users more time to update to either the 1.6 series or later, or to the latest patch release in their minor series.

Fixes #34014

Target Release

1.6.2

Draft CHANGELOG entry

BUG FIXES

• Fix interoperability issues between v1.6 series and earlier series by removing variable validations from the state file.

[alisdair]

Thanks for this! We should probably write the 1.7 CHANGELOG upgrade note now in case we forget later.

[github-actions]

Reminder for the merging maintainer: if this is a user-visible change, please update the changelog on the appropriate release branch.

[github-actions]

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