Allow Guests and Reporters to change the assignee of merge requests they author
<!-- The next four sections: "Problem to solve", "Intended users", "User experience goal", and "Proposal", are strongly recommended in your first draft, while the rest of the sections can be filled out during the problem validation or breakdown phase. However, keep in mind that providing complete and relevant information early helps our product team validate the problem and start working on a solution. --> <!-- ### Release notes --> <!-- What is the problem and solution you're proposing? This content sets the overall vision for the feature and serves as the release notes that will populate in various places, including the [release post blog](https://about.gitlab.com/releases/categories/releases/) and [Gitlab project releases](https://gitlab.com/gitlab-org/gitlab/-/releases). " --> ### Problem to solve As a community contributor to GitLab, I want to be able to add assignees, so that I can fully participate in GitLab's development workflow. ### Intended users - Community contributors submitting MRs to GitLab, and any other projects with a similar workflow. ### User experience goal A user who authors an MR can change the assignee of the MR even if that user does not normally have permission to change the assignee of MRs for that project. ### Proposal Add a project setting, "Allow merge requests authors to change the assignee of their merge requests regardless of access level." Change the security model for merge requests to allow a user who can author merge requests to change the assignee of a merge request if the user is the author of that merge request. ### Further details As a community contributor, my access level to `gitlab-org/gitlab` is `guest`, which means I can't change the assignee of merge request. This is somewhat problematic because GitLab's MR workflow involves assigning the MR back and forth between the author and reviewer(s). But community contributors (guests) cannot assign MRs, so we must rely solely on pinging. ### Permissions and Security - A user who cannot author merge requests cannot change MR assignee - A user who can author merge requests but cannot generally change MR assignee can change the assignee for MRs they authored Given the above, if a user is a Reporter and authors a merge request, and then Reporter access is revoked, they will no longer be able to change the merge request assignee. ### Documentation <!-- See the Feature Change Documentation Workflow https://docs.gitlab.com/ee/development/documentation/workflow.html#for-a-product-change * Add all known Documentation Requirements in this section. See https://docs.gitlab.com/ee/development/documentation/feature-change-workflow.html#documentation-requirements * If this feature requires changing permissions, update the permissions document. See https://docs.gitlab.com/ee/user/permissions.html --> ### Availability & Testing <!-- This section needs to be retained and filled in during the workflow planning breakdown phase of this feature proposal, if not earlier. What risks does this change pose to our availability? How might it affect the quality of the product? What additional test coverage or changes to tests will be needed? Will it require cross-browser testing? Please list the test areas (unit, integration and end-to-end) that needs to be added or updated to ensure that this feature will work as intended. Please use the list below as guidance. * Unit test changes * Integration test changes * End-to-end test change See the test engineering planning process and reach out to your counterpart Software Engineer in Test for assistance: https://about.gitlab.com/handbook/engineering/quality/test-engineering/#test-planning --> ### What does success look like, and how can we measure that? <!-- Define both the success metrics and acceptance criteria. Note that success metrics indicate the desired business outcomes, while acceptance criteria indicate when the solution is working correctly. If there is no way to measure success, link to an issue that will implement a way to measure this. Create tracking issue using the the Snowplow event tracking template. See https://gitlab.com/gitlab-org/gitlab/-/blob/master/.gitlab/issue_templates/Snowplow%20event%20tracking.md --> ### What is the type of buyer? <!-- What is the buyer persona for this feature? See https://about.gitlab.com/handbook/marketing/product-marketing/roles-personas/buyer-persona/ In which enterprise tier should this feature go? See https://about.gitlab.com/handbook/product/pricing/#four-tiers --> ### Is this a cross-stage feature? <!-- Communicate if this change will affect multiple Stage Groups or product areas. We recommend always start with the assumption that a feature request will have an impact into another Group. Loop in the most relevant PM and Product Designer from that Group to provide strategic support to help align the Group's broader plan and vision, as well as to avoid UX and technical debt. https://about.gitlab.com/handbook/product/#cross-stage-features --> ### Links / references
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