[Stunner] Does not support save and rename feature

Workbench assets support save and rename feature. It meas if you want to rename asset that is dirty, the workbench offers you two options.

1. Just rename, unsaved changes discarded
2. Save and rename, all changes preserved before renaming

The second option does not work in the stunner

PR Acceptance test

1. Create bpmn, do changes in canvas, Save and Rename, do changes in Metadata, Save and Rename
2. Create bpmn, do changes in canvas, Save and Rename, do changes in Metadata, Rename
3. Create bpmn, do changes in canvas, Rename, do changes in Metadata, Save and Rename
4. Create bpmn, do changes in canvas, Rename, do changes in Metadata, Rename
5. Check during doing changes editor is marked as dirty
6. Check after renaming: the process is in the project asset list AF-1190
7. Check after renaming: the process can be deleted