Add transient bug version of MWPS test

qa/qa/specs/features/browser_ui/3_create/merge_request/merge_when_pipeline_succeeds_spec.rb

@@ -29,7 +29,7 @@ module QA
                 content: <<~EOF
                   test:
                     tags: ["runner-for-#{project.name}"]
-                    script: sleep 5
+                    script: sleep 10
                     only:
                       - merge_requests
                 EOF
@@ -47,6 +47,19 @@ module QA
       end
 
       it 'merges when pipeline succeeds', testcase: 'https://gitlab.com/gitlab-org/quality/testcases/-/issues/1684' do
+        verify_merge_when_pipeline_succeeds
+      end
+
+      it 'reliably merges when pipeline succeeds', :transient, testcase: 'https://gitlab.com/gitlab-org/quality/testcases/-/issues/1684' do
+        verify_merge_when_pipeline_succeeds(repeat: Runtime::Env.transient_trials) do |i|
+          QA::Runtime::Logger.info("Transient bug test - Trial #{i}")
+        end
+      end
+
+      def verify_merge_when_pipeline_succeeds(repeat: 1)
+        repeat.times do |i|
+          yield i if block_given?
+
           branch_name = "merge-request-test-#{SecureRandom.hex(8)}"
 
           # Create a branch that will be merged into the default branch
@@ -82,4 +95,5 @@ module QA
         end
       end
     end
+  end
 end