Use the web IDE to resolve merge conflicts
<!--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=550877) </details> <!--IssueSummary end--> ## Proposal The current UI for merging conflicts can be confusing and the ability to include "both" is not yet available. This proposal suggests the use of the Web IDE to be the interface for managing merge conflicts. Originally suggested in https://gitlab.com/gitlab-org/gitlab/-/issues/360807#note_2308872876 ![image](/uploads/86ca1ee23fd4df412465b6ca1ce268b7/image.png)
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