orchestrator-core Improvements to migrate-workflows wizard

[hanstrompert]

Problem to solve

When there are a lot of workflows and product_types, the current selection menu is a bit unwieldy. In other words, the list of workflows can become very long.

Intended users

All workfloworchestrator custom implementation developers.

Proposal

• When selecting a workflow to create. Separate the workflows into the ones missing in the db and already present in the db.
• Possibility to delete multiple workflows by entering a comma-separated list

Tasks

• [ ] extra step to separate by lifecycle state
• [ ] add (new) after not already linked workflows