Replace hardcoded HAF_COMMIT with dynamic image detection

Use find_haf_image job from common-ci-configuration to automatically detect
the latest HAF image from the registry. This eliminates the need for manual
HAF_COMMIT updates and the validate_haf_commit job.

Changes:
- Add detect stage with find_haf_image job
- Replace HAF's prepare_data_image_job.yml include with common-ci-configuration templates
- Remove validate_haf_commit job (no longer needed)
- Remove prepare_haf_image job (use pre-built images from HAF registry)
- Update sync job to depend on find_haf_image and use HAF_UPSTREAM_COMMIT
- Update pre_get_sources_script to handle both HAF_COMMIT and HAF_UPSTREAM_COMMIT