Update ai_framework events to include internal_event property

ee/config/events/ai_response_time.yml

 ---
 description: This event represents the time from DuoChat prompt being sent to first chunk received on client
 action: ai_response_time
+internal_events: true
 identifiers:
 - project
 - user

ee/config/events/submit_gitlab_duo_question.yml

 ---
 description: This event represents a successful submission of a GitLab Duo question by a user.
-category: default
 action: submit_gitlab_duo_question
-extra_properties:
+internal_events: true
 identifiers:
 - project
 - user