Add default HIVE_SCRIPTS_REF to prepare_haf_image template

Dan Notesteinrequested to merge
fix/hive-scripts-ref-default into develop

Summary

  • Add default HIVE_SCRIPTS_REF: "develop" to .prepare_haf_image template
  • Update documentation to show HIVE_SCRIPTS_REF is now optional

Testing

  • Fixes prepare_haf_image failures in balance_tracker and reputation_tracker MRs

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