MDL-59159 upgrade: remove unused functions/settings from upgradelib
All these functions were used only by deleted upgrade steps so it's safe to proceed with straight deletion, considering them internal. Deletion has been documented in corresponding upgrade.txt files: - mod_feedback_upgrade_delete_duplicate_values() - mod_feedback_upgrade_courseid() These have been kept because they continue being used: - @ install: make_competence_scale() - @ restore: upgrade_course_letter_boundary()
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