Merge Request edit: make breadcrumbs consistent

This change was first introduced in merge request
https://gitlab.com/gitlab-org/gitlab/-/merge_requests/62138.

Changelog: other

changelogs/unreleased/santigl-edit-mr-breadcrumbs.yml

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-title: 'Merge Request edit: make breadcrumbs consistent'
-merge_request: 62138
-author: Santiago Gil @santigl
-type: other