Fix standalone compilation of InteractionRegion.h

The header InteractionRegion.h introduced in !4173 (merged) cannot be compiled by itself because of a minor misconfiguration.

This MR rectifies the problem.

added lhcb-gaudi-head label

added RTA label

• [2023-10-11 00:04] Validation started with lhcb-gaudi-head#3707
• [2023-10-12 00:04] Validation started with lhcb-gaudi-head#3708
• [2023-10-13 00:03] Validation started with lhcb-gaudi-head#3709
• [2023-10-13 12:02] Validation started with lhcb-gaudi-head#3710
• [2023-10-14 00:20] Validation started with lhcb-gaudi-head#3711
• [2023-10-14 08:22] Validation started with lhcb-gaudi-head#3712
• [2023-10-15 00:03] Validation started with lhcb-gaudi-head#3713
• [2023-10-17 00:04] Validation started with lhcb-gaudi-head#3714
• [2023-10-17 12:06] Validation started with lhcb-gaudi-head#3715
• [2023-10-18 00:35] Validation started with lhcb-gaudi-head#3716
• [2023-10-18 07:06] Validation started with lhcb-gaudi-head#3717
• [2023-10-19 00:04] Validation started with lhcb-gaudi-head#3718
• [2023-10-19 00:36] Validation started with lhcb-gaudi-head#3718
• [2023-10-19 07:17] Validation started with lhcb-gaudi-head#3719
• [2023-10-19 11:36] Validation started with lhcb-gaudi-head#3720
• [2023-10-19 14:17] Validation started with lhcb-master-mr#9494
• [2023-10-20 00:04] Validation started with lhcb-gaudi-head#3721
• [2023-10-20 00:37] Validation started with lhcb-gaudi-head#3721
• [2023-10-20 10:54] Validation started with lhcb-master-mr#9504
• [2023-10-21 00:04] Validation started with lhcb-gaudi-head#3722
• [2023-10-22 00:04] Validation started with lhcb-gaudi-head#3723
• [2023-10-24 00:04] Validation started with lhcb-gaudi-head#3724
• [2023-10-25 00:04] Validation started with lhcb-gaudi-head#3725
• [2023-10-26 00:04] Validation started with lhcb-gaudi-head#3726
• [2023-10-27 00:04] Validation started with lhcb-gaudi-head#3727
• [2023-10-28 00:04] Validation started with lhcb-gaudi-head#3728
• [2023-10-31 00:03] Validation started with lhcb-gaudi-head#3729

mentioned in merge request !4322 (merged)

added bug fix cleanup labels

merged

mentioned in commit 231c540d