Resolve Conflicts button missing on merge requests for some users
Summary
A user who makes a merge request is not able to see the Resolve Conflicts button. The /conflicts url still works.
Steps to reproduce
The user who is the owner of a repository has a Resolve Conflicts button on merge requests which shows the conflicts that need to be resolved. The user who made the merge request should also be able to view the conflicts so they know what they need to fix. The Resolve Conflicts button is missing for them, but the url still works. The button should be available to them.