Fix HAF_COMMIT variable inheritance in validation template

Dan Notesteinrequested to merge
fix/haf-commit-validation-template into develop

Summary

  • Remove default empty value for HAF_COMMIT in .haf_commit_validation template
  • Template defaults override global variables, so setting HAF_COMMIT="" in the template prevented apps from using their global HAF_COMMIT variable

Testing

  • This fixes validate_haf_commit failures in balance_tracker and reputation_tracker MRs

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