Add a definition for anti-abuse snowplow events emitted by GitLab Backend

config/events/failed_attempt.yml

+---
+description: Tracks Credit card validation errors as part of Identity Verification
+action: failed_attempt
+identifiers:
+- user
+product_group: anti-abuse
+milestone: '15.9'
+introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/169117
+distributions:
+- ce
+- ee
+tiers:
+- free
+- premium
+- ultimate
+additional_properties:
+  property:
+    description: Error message

ee/config/events/sent_instructions.yml

+---
+description: Tracks when a confirmation instruction email is sent as part of Identity Verification
+action: sent_instructions
+identifiers:
+- user
+product_group: anti-abuse
+milestone: '15.9'
+introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/169117
+distributions:
+- ee
+tiers:
+- free
+- premium
+- ultimate

ee/config/events/telesign_sms_delivery_failed.yml

+---
+description: Tracks when a SMS message fails to sent via Telesign
+action: telesign_sms_delivery_failed
+identifiers:
+- user
+product_group: anti-abuse
+milestone: '16.6'
+introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/169117
+distributions:
+- ee
+tiers:
+- free
+- premium
+- ultimate

ee/config/events/telesign_sms_delivery_success.yml

+---
+description: Tracks when a SMS message is successfully sent via Telesign
+action: telesign_sms_delivery_success
+identifiers:
+- user
+product_group: anti-abuse
+milestone: '16.6'
+introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/169117
+distributions:
+- ee
+tiers:
+- free
+- premium
+- ultimate