Bulk Delete Feature for Journey Overview

[#1]

Overview

This change request proposes adding functionality to allow users to delete multiple journeys simultaneously from the Journey overview, with built-in dependency checks to prevent deletion of journeys in active states.

Current Behavior

Currently, users can select multiple journeys in the Journey overview (indicated by a blue line showing the number of selected items), but must delete journeys individually through each journey's ellipsis menu.

Proposed Changes

1. Enable bulk deletion of multiple selected journeys through a single action
2. Implement/Keep as is - dependency checks to prevent deletion of "Published" (including "In review", "Dry Run") journeys. Only delete when status is Draft, Draft (Test), Finished or similar. 
3. Add a "Delete Selected" button that appears in the blue selection bar when multiple journeys are selected
4. Display a confirmation dialog showing:
   • Number of journeys that will be deleted
   • Number of journeys that cannot be deleted (with their states)
   • Option to proceed with deleting eligible journeys only

Validation

• Only journeys in Draft, Draft (Test), Finished or similar status can be deleted
• If mixed selection (some eligible, some ineligible), provide clear feedback on which can be deleted
• After deletion, the selection counter should accurately reflect remaining selected items

Error Handling

• If deletion fails for any journey, show appropriate error message
• Provide detailed feedback on which journeys were successfully deleted and which weren't

Benefits

• Improved user efficiency when managing multiple journeys
• Reduced risk of accidentally deleting active journeys
• Consistent user experience for bulk operations