Fix merge trains checkbox

qa/qa/page/project/settings/merge_request.rb

@@ -29,7 +29,7 @@ def enable_ff_only
           end
 
           def enable_merge_if_all_disscussions_are_resolved
-            check_element(:allow_merge_if_all_discussions_are_resolved_checkbox)
+            check_element(:allow_merge_if_all_discussions_are_resolved_checkbox, true)
             click_save_changes
           end
         end

qa/qa/specs/features/ee/browser_ui/4_verify/new_discussion_not_dropping_merge_trains_mr_spec.rb

 # frozen_string_literal: true
 
 module QA
-  RSpec.describe 'Verify', :docker, :runner do
+  RSpec.describe 'Verify', :runner do
     describe 'In merge trains' do
       context 'new thread discussion' do
-        let(:executor) { "qa-runner-#{Faker::Alphanumeric.alphanumeric(8)}" }
+        let(:executor) { "qa-runner-#{Faker::Alphanumeric.alphanumeric(number: 8)}" }
         let!(:runner) do
           Resource::Runner.fabricate! do |runner|
             runner.project = project