Add an empty state for merge trains page
Release notes
Problem to solve
A blank state when merge trains are enabled but no active train running for a branch.
See the page design in #277391 (closed)
Intended users
User experience goal
Users should not be confused about why they're not seeing any items on the merge trains list view even after they've enabled merge trains as a feature.
Proposal
Add an empty state with a message: There are no active trains in <project name>. New merge requests added to the train will show on this page. (needs refinement by TW).
Further details
Requires an illustration.
Permissions and Security
Documentation
Availability & Testing
Available Tier
Feature Usage Metrics
What does success look like, and how can we measure that?
What is the type of buyer?
Is this a cross-stage feature?
What is the competitive advantage or differentiation for this feature?
Links / references
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