Use prepend: true to evaluate always perform_fast_destroy than dependent: :destroy

app/models/concerns/fast_destroy_all.rb

@@ -74,7 +74,7 @@ module FastDestroyAll
       # This method is to be defined on models which have fast destroyable models as children,
       # and let us avoid to use `dependent: :destroy` hook
       def use_fast_destroy(relation)
-        before_destroy do
+        before_destroy(prepend: true) do
           perform_fast_destroy(public_send(relation)) # rubocop:disable GitlabSecurity/PublicSend
         end
       end

app/models/project.rb

@@ -80,9 +80,6 @@ class Project < ActiveRecord::Base
 
   before_destroy :remove_private_deploy_keys
 
-  ##
-  # `use_fast_destroy` must be defined **before** `has_many` and `has_one` such as `has_many :relation, dependent: :destroy`
-  # Otherwise `use_fast_destroy` performs against **deleted** rows, which fails to get identifiers of external data
   use_fast_destroy :build_trace_chunks
 
   after_destroy -> { run_after_commit { remove_pages } }