ci: add do not merge label to kodiak (#31551)

.kodiak.toml

@@ -5,9 +5,8 @@ version = 1
 method = "squash"
 automerge_label = ["stat: ready to merge", "automerge"]
 block_on_neutral_required_check_runs = true
-blocking_labels = ["stat: needs QA", "Invalid PR Title"]
+blocking_labels = ["stat: needs QA", "Invalid PR Title", "do not merge"]
 prioritize_ready_to_merge =  true
-merge.do_not_merge=true
 
 [merge.message]
 title = "pull_request_title"