Update the existing merge request creation service specs to ensure they work correctly with both v1 and v2 approval rules. Benefits: - Validates that MR creation works correctly with v2 approval rules - Ensures backward compatibility with v1 approval rules - Catches integration issues between MR creation and approval rules - Provides confidence in the v2 feature flag rollout Requirements (validate these during implementation and adjust as needed): - Update specs in `ee/spec/services/merge_requests/create_service_spec.rb` to test with v2 feature flag enabled - Add test cases for v2 approval rules being created during MR creation - Verify that project rules are properly inherited when v2 is enabled (covered in Sub-Epic 2) - Test that existing v1 specs continue to pass with feature flag disabled - Add shared examples for v1 and v2 behavior where appropriate - Test edge cases like creating MR when `disable_overriding_approvers_per_merge_request` is enabled Reference: [v2 Approval Rules POC](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/222865) - See `ee/app/services/ee/merge_requests/create_service.rb` for integration points