Flaky EE spec in spec/ee/spec/features/boards/scoped_issue_board_spec.rb

https://gitlab.com/gitlab-org/gitlab-ee/-/jobs/46039338

  1) Scoped issue boards user with edit permissions edit board milestone sets board to upcoming milestone
     Failure/Error: expect(page).to have_selector('.board-list-loading')
       expected to find visible css ".board-list-loading" but there were no matches
     # ./spec/ee/spec/features/boards/scoped_issue_board_spec.rb:535:in `update_board_scope'
     # ./spec/ee/spec/features/boards/scoped_issue_board_spec.rb:482:in `update_board_milestone'
     # ./spec/ee/spec/features/boards/scoped_issue_board_spec.rb:228:in `block (5 levels) in <top (required)>'

/cc: @oswaldo