ci: PLT-741: Atomic Merge: Disable FM dispatch on pr close

Author: nikitabelonogov

.github/workflows/follow-merge-dispatch.yml

@@ -4,7 +4,6 @@ on:
   pull_request_target:
     types:
       - opened
-      - closed
       - converted_to_draft
       - ready_for_review
       - synchronize