Bug: MR was removed from train toast message shows several times on MRs after they are merged
Problem
When visiting an MR that was merged via a merge train, several toast messages show for said MR. This should only happen once when the remove action is made. Looks like !153974 (merged) introduce the issue.
Solution
We should probably move away from a watcher
in ee/app/assets/javascripts/vue_merge_request_widget/components/merge_train_position_indicator.vue
and add an on click action to only show the toast message one time. Or introduce more logic for the use-case when an MR is merged.