If a Terraform state was created before versioning support was
introduced, it will have a single version record whose file
uses a legacy naming scheme in object storage. To update
these states and versions to use the new behaviour, we must do
the following when creating the next version:

 * Read the current, non-versioned file from the old location.
 * Update the :versioning_enabled flag, which determines the
   naming scheme
 * Resave the existing file with the updated name and location,
   using a version number one prior to the new version
 * Create the new version as normal

This migration only needs to happen once for each state, from
then on the state will behave as if it was always versioned.

This code can be removed in the next major version (14.0), after
which any states that haven't been migrated will need to be
recreated

https://gitlab.com/gitlab-org/gitlab/-/merge_requests/43665