List conflicting files in the merge request widget
## Problem to solve When merge conflicts exist, GitLab doesn't tell me in which files the conflicts exist, which means I don't know how to approach resolving the conflicts or why the rebase isn't possible. If I have a `yarn.lock` file or some other machine managed file, this might be quite reasonable, expected, and can be resolved automatically with tooling, but if it is some other file I might want to investigate more deeply. ## Further details GitHub lists the conflicting files when merging/rebasing is disabled :sparkles: ## Proposal List the conflicting files in the merge widget ## Links / references https://serokell.io/blog/comparison-of-github-and-gitlab
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