Transient failure in `qa/specs/features/ee/browser_ui/6_release/pipelines_for_merged_results_and_merge_trains_spec.rb:87` / `expect(merged).to be_truthy, "Expected content 'The changes were merged' but it did not appear."`

As seen in https://ops.gitlab.net/gitlab-org/quality/staging/-/jobs/839297:

429   2) Release Pipelines for merged results and merge trains merges via a merge train
430      Failure/Error: expect(merged).to be_truthy, "Expected content 'The changes were merged' but it did not appear."
431        Expected content 'The changes were merged' but it did not appear.
432      # ./qa/specs/features/ee/browser_ui/6_release/pipelines_for_merged_results_and_merge_trains_spec.rb:126:in `block (3 levels) in <module:QA>'
433      # /usr/local/bundle/gems/rspec-retry-0.6.1/lib/rspec/retry.rb:123:in `block in run'
434      # /usr/local/bundle/gems/rspec-retry-0.6.1/lib/rspec/retry.rb:110:in `loop'
435      # /usr/local/bundle/gems/rspec-retry-0.6.1/lib/rspec/retry.rb:110:in `run'
436      # /usr/local/bundle/gems/rspec-retry-0.6.1/lib/rspec_ext/rspec_ext.rb:12:in `run_with_retry'
437      # ./spec/spec_helper.rb:68:in `block (2 levels) in <top (required)>'
438      # /usr/local/bundle/gems/rspec-retry-0.6.1/lib/rspec/retry.rb:123:in `block in run'
439      # /usr/local/bundle/gems/rspec-retry-0.6.1/lib/rspec/retry.rb:110:in `loop'
440      # /usr/local/bundle/gems/rspec-retry-0.6.1/lib/rspec/retry.rb:110:in `run'
441      # /usr/local/bundle/gems/rspec-retry-0.6.1/lib/rspec_ext/rspec_ext.rb:12:in `run_with_retry'
442      # /usr/local/bundle/gems/rspec-retry-0.6.1/lib/rspec/retry.rb:37:in `block (2 levels) in setup'

pipelines_for_merged_results_and_merge_trains_spec.rb_2020-01-13-20-30-00.180.html