OBGM-532 Add UI for switching root category on category tree page (#4269)
* OBGM-532 Add a migration to change is_root value on ROOT category to true
* OBGM-532 Add ability to switch roots on category tree page
- added categoryDsta Service
- added select on category tree to switch root categories
- handle contraint validation on category delete
* OBGM-532 Submit request to tree with chosen id on option select
* OBGM-532 Add is_root null condition to migration
