[4.0] [Workflow] Add checks for deletion of workflow/states/transitions

[bembelimen]

Is your feature request related to a problem? Please describe.

If you trash/delete a workflow/state/transition, there are no real checks if there are assigned articles.

Describe the solution you'd like

Add all the checks into the Content - Joomla plugin (like for categories)

@priiish perhaps you can continue with your PR: bembelimen#17

[bembelimen]

#21579