Finally, the remote ocr workflow (#13637)

* Ok! Backend stuff for the remote ocr workflow

* Frotnend workflow stuff

* And docs

* Fix dynamic action fields thing

* Actually, fix the action dropdown thing

* Fix this validation thing, and we have to check existing actions

* Fix migration

src/documents/models.py

@@ -1670,6 +1670,10 @@ class WorkflowAction(models.Model):
             6,
             _("Move to trash"),
         )
+        REMOTE_OCR = (
+            7,
+            _("Remote OCR"),
+        )
 
     type = models.PositiveSmallIntegerField(
         _("Workflow Action Type"),