Add me and unassigned assignee options

Co-Authored-By: Paperclip <noreply@paperclip.ing>

ui/src/context/DialogContext.tsx

@@ -5,6 +5,7 @@ interface NewIssueDefaults {
   priority?: string;
   projectId?: string;
   assigneeAgentId?: string;
+  assigneeUserId?: string;
   title?: string;
   description?: string;
 }