Enhance select of milestones or components (BB-4564)

With a new issue you can select component and milestone.

Would be great if you parse the milestones and components from:

• "Persistence\DB"
• "Persistence\File"

to a indented select

{{

{\\ <select> <option>Persistence</option> <option>  DB</option> <option>  File</option> </select> }}

}