chore: #3634618 Update version references to 9.x-dev

AI Yasrequested to merge
issue/cloud-3634618:3634618-update-version-references into 9.x

Summary

Restore the 60 version references updated for the 9.0.0-alpha1 release to 9.x-dev across libraries, documentation, PHP, CloudFormation and Kubernetes templates. The release tag remains unchanged.

Validation

  • The resulting Git tree exactly matches the previously tested 9.x compatibility tree from before the release-version changes.
  • Pipeline 1026091 tests Drupal 11.4 and Drupal 12 using three PHPUnit shards per version, along with Composer and static checks.
  • Parsed the 15 changed static YAML files, verified unique CloudFormation AllowedValues, checked PHP syntax and git diff --check, and confirmed no tracked 9.0.0-alpha1 references remain.

Related to #3634618.

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