Cherry picked gitleaksignore changes

Author: tdroza-nhs

.gitleaksignore

@@ -9,3 +9,7 @@ cd9c0efec38c5d63053dd865e5d4e207c0760d91:docs/guides/Perform_static_analysis.md:
 0cbdddbf54927dfc4a226b88d2fed045dfc0cb92:docs/cloudevents/digital-letters/2025-10/example-events/file-deleted-event.md:ipv4:42
 0cbdddbf54927dfc4a226b88d2fed045dfc0cb92:docs/cloudevents/digital-letters/2025-10/example-events/file-deleted-event.json:ipv4:21
 52386bca9b88c0c8c7dee52ab0ec69d04fb72c46:src/TESTING_PLAN.md:ipv4:145
+f8546e35b77b69ba7b15dbe3174d2d7e375200ef:utils/utils/src/__tests__/key-generation/validate-private-key.test.ts:private-key:7
+f8546e35b77b69ba7b15dbe3174d2d7e375200ef:utils/utils/src/__tests__/key-generation/get-private-key.test.ts:private-key:23
+f8546e35b77b69ba7b15dbe3174d2d7e375200ef:utils/utils/src/__tests__/key-generation/get-private-key.test.ts:private-key:30
+f8546e35b77b69ba7b15dbe3174d2d7e375200ef:utils/utils/src/__tests__/key-generation/get-private-key.test.ts:private-key:46