Add missing find_package

added Build cleanup lhcb-head-2 labels

assigned to @rmatev

added RTA label

• [2022-03-05 00:24] Validation started with lhcb-head-2#489
• [2022-03-05 01:01] Validation started with lhcb-head-2#489
• [2022-03-06 00:12] Validation started with lhcb-head-2#490

merged

mentioned in commit c720a935

mentioned in issue Moore#411 (closed)