[Frontend] Role-based permissions for Issue to Merge Request Flow

Summary

Integrate frontend permission checks for the "Generate MR with Duo" flow based on minimum_access_level_execute_asynchronously permission.

Background

Issue to Merge Request Flow is a foundational background flow that requires Developer+ role. Users should only see the "Generate MR with Duo" button in issues if they have the appropriate execute permission.

Requirements

Hide/disable "Generate MR with Duo" button when user lacks permission
Check permission in issue detail view
Show appropriate message when permission is denied
Ensure UI updates reflect permission state

Locations

Plan > Issues > Issue detail page > "Generate MR with Duo" button (below issue header)

Acceptance Criteria

Button hidden/disabled for users without Developer+ role or custom permission
Permission check respects instance and namespace-level settings
Clear messaging when access is denied

Parent Epic: &19742
Backend: #578553

Edited Dec 03, 2025 by 🤖 GitLab Bot 🤖