wip & added mark_appointment_as_dna util to utils/appointments

Author: Andyg79

.gitleaksignore

@@ -224,3 +224,4 @@ cd9c0efec38c5d63053dd865e5d4e207c0760d91:docs/guides/Perform_static_analysis.md:
 cae84544e2852202f5d0abb9ad18f9d83a0c6d80:subject_criteria_builder/criteria.json:generic-api-key:4210
 203cd8811be75d33859eb7c7cc8a48beb5a2b8b2:subject_criteria_builder/criteria.json:generic-api-key:4210
 60468a7d6f3ff3259616757be85d6f07e62d00b6:subject_criteria_builder/criteria.json:generic-api-key:4210
+145171b9e9d169acb136fc527708c997c9ad9f61:subject_criteria_builder/criteria.json:generic-api-key:4210