Provide more details of why a cherry-pick or revert failed in the UI
<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=218445) </details> <!--IssueSummary end--> ### Problem to solve https://gitlab.com/gitlab-org/gitlab/-/issues/33178 offers an error code in the API response clarifying what is the issue that prevented a cherry-pick from finishing successfully. However, that information isn't show in the UI. This might be confusing in the case of a cherry-pick conflict, as the default error message doesn't suggest that the error might be due to a conflict. ### Intended users * [Delaney (Development Team Lead)](https://about.gitlab.com/handbook/marketing/product-marketing/roles-personas/#delaney-development-team-lead) * [Sasha (Software Developer)](https://about.gitlab.com/handbook/marketing/product-marketing/roles-personas/#sasha-software-developer) ### User experience goal The user should be able to figure out quickly why the cherry-pick didn't finish successfully. ### Proposal Add more details as to why the cherry pick didn't go through ### Documentation ### Links / references ZD https://gitlab.zendesk.com/agent/tickets/156986 (internal)
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