FE: Update MR widget for warn mode

Why are we doing this work

• The MR widget needs to show information for the warn mode policy violations
• Users should be able to dismiss warn mode policy violations

Relevant links

Non-functional requirements

• Documentation:
• Feature flag:
• Performance:
• Testing:

Implementation plan

• Add info icon and button to vue_merge_request_widget/components/checks/security_policy_violations.vue
  • ee/app/assets/javascripts/vue_merge_request_widget/components/checks/requested_changes.vue does a modal, follow it
• On click, open modal with form
• On save, mutation saves info and returns confirmation
• On confirm, button is disabled and replaced with “dismissed”
  • Replaced with warning (how?) No longer blocks MR (how?)
  • ❓I think calling updateMergeRequestMutation will update the widget, but it only has the option to overriderequestedchanges, so we also need to modify it to have a new property called overrideSecurityPolicies that triggers the warning state
  • ❓We also need a new mutation to save the event to audit or tie it into that new property
• Update title on MR widget
  • ❓Might be ee/app/assets/javascripts/vue_merge_request_widget/mixins/ready_to_merge.js

Verification steps