We should be able to define what transitions are available for external users.
So we could limit possible transitions.
Currently all transitions are available for external user.

Research is needed: can we take all transitions from workflow via API?
Should available transitions be defined in our UI?
How this should work for shared board/jql/roadmap where there can be issues from different projects / different workflows?

If it is to not possible to access possible transitions. We should present custom UI.

Something like:
From: <status-picker> To: <status-picker> <add>
There should be by default <any>status which will be wildcard representing any status.

So user can transition:
from any to X status or from Y status to any or from any to any
There can be multiple of those rules in configuration:
- From A to B
- From B to C
- From D to any
- From any to E