Allow Duo Core user to still use DAP code review
What does this MR do and why?
We are about to remove Duo Core from classic chat's scope. To still allow user to use Duo Code Review (by mentioning @GitlabDuo when replying to a MR), for now we temporarily revert the unit_primitive to "duo_chat".
References
Screenshots or screen recordings
The first reply is before the fix, and second reply is after the fix:
How to set up and validate locally
- applying the Duo Core removal step 7~9: https://gitlab.com/gitlab-org/gitlab/-/work_items/581229#steps
- ensure Prerequisites has been set up: https://docs.gitlab.com/user/duo_agent_platform/flows/foundational_flows/code_review/#use-the-flow
- add a comment in an MR, mentioning
@gitlabduo
MR acceptance checklist
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Related to #581229
