feat(ddm): Add ddm_view guide in BE (#61745)

Add `ddm_view` guide in BE definitions.

- part of https://github.com/getsentry/sentry/issues/60794

src/sentry/assistant/guides.py

@@ -30,6 +30,7 @@ GUIDES = {
     "explain_new_default_event_issue_detail": 31,
     "new_project_filter": 32,
     "explain_archive_button_issue_stream": 33,
+    "ddm_view": 34,
 }
 
 # demo mode has different guides